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Q1. Ammeter is used to measure:
An ammeter is used to measure electric current flowing through a circuit. It is always connected in series with the circuit so that the entire current passes through it. The unit of measurement is amperes (A).
Q2. What is the shape of the magnetic field lines around a straight current-carrying conductor?
The magnetic field lines around a straight current-carrying conductor are in the form of concentric circles. The circles are centred on the wire, and the direction is given by the right-hand thumb rule. The field strength decreases as we move away from the wire.
Q3. The magnetic field around a conductor increases when current is:
The magnetic field around a conductor is directly proportional to the current flowing through it. So, increasing the current increases the magnetic field strength. This is why the deflection of a compass needle is more when current is higher.
Q4. The magnetic field produced by current is also called:
The magnetic field produced by an electric current is called an electromagnetic field. This field is a combination of electric and magnetic fields. The study of this field is called electromagnetism.
Q5. Increasing the current in the wire causes compass deflection to:
Increasing the current in the wire increases the magnetic field around it. This stronger field causes the compass needle to deflect more. The deflection is directly proportional to the current.
Q6. Magnetic field lines indicate the direction of force on a:
Magnetic field lines indicate the direction of force on a north pole placed in the field. The direction of the field is defined as the direction in which a north pole would move if placed in the field.
Q7. Reversing the direction of current causes the compass needle to deflect:
Reversing the direction of current reverses the direction of the magnetic field. As a result, the compass needle deflects in the opposite direction. This shows that the direction of the magnetic field depends on the direction of current.
Q8. Field lines help us understand the:
Field lines help us understand both the direction and strength of a magnetic field. The direction is shown by arrows, and the strength is indicated by the spacing of the lines. Closer lines mean a stronger field.
Q9. Crossing of magnetic field lines is:
Crossing of magnetic field lines is impossible. If two field lines crossed, it would mean the magnetic field has two different directions at the same point, which is not possible. Field lines always remain distinct.
Q10. The direction of magnetic field at a point is given by the direction of:
The direction of the magnetic field at a point is given by the direction in which the north pole of a compass needle points when placed at that point. This is the standard convention for defining field direction.
Q11. What happens to the magnetic field around a wire if the direction of current is reversed?
If the direction of current is reversed, the direction of the magnetic field around the wire also reverses. The right-hand thumb rule shows that the field direction depends on the current direction.
Q12. By convention, magnetic field lines emerge from the:
By convention, magnetic field lines emerge from the north pole of a magnet and enter the south pole. Inside the magnet, they go from south to north, forming closed loops.
Q13. Decreasing the current in the wire causes the magnetic field strength to:
The magnetic field strength is directly proportional to the current. Decreasing the current reduces the magnetic field strength, so the compass needle deflects less. When current is zero, the field disappears.
Q14. Iron filings around a current-carrying wire arrange in the form of:
Iron filings around a current-carrying straight wire arrange themselves in concentric circles, showing the pattern of the magnetic field lines. This is the same pattern observed with a compass.
Q15. The magnetic field around a straight wire is symmetrical about the:
The magnetic field around a straight current-carrying wire is symmetrical about the wire. The field lines are concentric circles centred on the wire, so the pattern looks the same from any direction around the wire.
Q16. Magnetic field due to current was first observed using a:
The magnetic field due to electric current was first observed by Oersted using a compass needle. He noticed that the compass needle deflected when placed near a current-carrying wire.
Q17. Iron filings align themselves due to:
Iron filings align themselves due to the magnetic force exerted by the magnetic field. Each filing becomes a tiny magnet and aligns along the field lines, showing the pattern of the field.
Q18. The direction of magnetic field is shown by arrows on:
The direction of the magnetic field is shown by arrows on field lines. The arrow points from the north pole to the south pole outside the magnet, indicating the direction of the field.
Q19. Magnetic field lines around straight conductor are perpendicular to:
In experiments, the cardboard is placed perpendicular to the wire. The magnetic field lines appear as concentric circles on the cardboard, which is perpendicular to the wire.
Q20. The magnetic field produced by a straight conductor is circular because:
The magnetic field produced by a straight conductor is circular because the field spreads uniformly around the wire in all directions. This symmetry causes the field lines to form concentric circles.
Q21. The relative strength of a magnetic field is shown by:
The relative strength of a magnetic field is shown by the closeness (density) of field lines. Closer lines indicate a stronger field, while farther apart lines indicate a weaker field.
Q22. Reversal of current reverses the direction of:
Reversal of current reverses the direction of the magnetic field around the conductor. This is because the direction of the field depends on the direction of current flow, as given by the right-hand thumb rule.
Q23. Magnetic field pattern depends on the:
The magnetic field pattern depends on the shape of the conductor. A straight wire produces circular field lines, while a circular loop produces field lines that are different. The pattern also depends on the current direction.
Q24. Magnetic field due to current was verified experimentally using:
The magnetic field due to current was verified experimentally using iron filings and a compass. Iron filings show the pattern, and the compass shows the direction of the field.
Q25. The concentric circles represent:
The concentric circles around a straight current-carrying conductor represent the magnetic field lines. They show the direction and pattern of the magnetic field.
Q26. Iron filings do not stick permanently because they are:
Iron filings do not stick permanently because they are soft magnetic materials. They become magnetized in the presence of a magnetic field but lose their magnetism when the field is removed.
Q27. What is the rule used to determine the direction of the magnetic field around a current-carrying conductor?
The right-hand thumb rule is used to determine the direction of the magnetic field around a current-carrying conductor. If you point your thumb in the direction of current, your fingers curl in the direction of the magnetic field.
Q28. Rheostat is used in the circuit to:
A rheostat is a variable resistor used to change the current in a circuit. By adjusting its resistance, the current can be increased or decreased, which changes the strength of the magnetic field.
Q29. A current-carrying conductor produces a:
A current-carrying conductor produces a magnetic field around it. This is the magnetic effect of electric current. The field lines are concentric circles around the conductor.
Q30. If current becomes zero, the magnetic field:
If the current becomes zero, the magnetic field disappears because the field is produced by the current. No current means no magnetic field. This shows that the magnetic field is directly dependent on the current.
Q31. If current flows from north to south, the compass needle moves towards:
The deflection of the compass needle depends on the direction of current and the position of the compass. It follows the right-hand thumb rule.
Q32. Magnetic field lines are imaginary lines used to represent:
Magnetic field lines are imaginary lines used to represent the magnetic field. They show the direction and strength of the field and are a visual tool to understand magnetic effects.
Q33. A compass placed near a current-carrying wire shows deflection due to:
A compass placed near a current-carrying wire shows deflection due to the magnetic effect of electric current. The current produces a magnetic field that interacts with the compass needle.
Q34. Magnetic field is strongest where field lines are:
The magnetic field is strongest where field lines are crowded (closely spaced). The density of field lines indicates the strength of the magnetic field.
Q35. Magnetic field lines are closer near the wire when current is:
Magnetic field lines are closer near the wire when the current is high. A higher current produces a stronger magnetic field, which is represented by more closely spaced field lines.
Q36. Magnetic field lines around a straight conductor are:
Magnetic field lines around a straight current-carrying conductor are circular (concentric circles). The circles are centred on the wire, and the direction is given by the right-hand thumb rule.
Q37. The direction of magnetic field depends on the direction of:
The direction of the magnetic field depends on the direction of the electric current. Reversing the current reverses the magnetic field direction. This is given by the right-hand thumb rule.
Q38. Field lines are closer together when magnetic field is:
Field lines are closer together when the magnetic field is strong. The density of field lines indicates the strength of the field. Closer lines mean a stronger field.
Q39. Magnetic field lines merge at the:
Magnetic field lines converge at both poles. They emerge from the north pole and merge at the south pole. This shows that the field is strongest at the poles.
Q40. Compass needle deflection proves that current produces:
Compass needle deflection proves that electric current produces a magnetic effect. The magnetic field around the wire interacts with the compass needle, causing it to deflect.
Q41. The study of magnetic fields produced by electric current is part of:
The study of magnetic fields produced by electric current is part of electromagnetism. It deals with the relationship between electricity and magnetism, which is fundamental to many technologies.
Q42. A compass placed on a circular field line shows:
A compass placed on a circular field line shows the direction of the magnetic field. The compass needle aligns tangentially to the circle, indicating the direction of the field at that point.
Q43. When current flows from south to north, the compass needle moves towards:
The deflection of the compass needle depends on the direction of current and the position of the compass. It follows the right-hand thumb rule.
Q44. The magnetic field direction reverses when:
The magnetic field direction reverses when the current reverses. This is because the field direction is directly linked to the direction of current flow.
Q45. Inside a magnet, the direction of magnetic field lines is from:
Inside a magnet, the direction of magnetic field lines is from the south pole to the north pole. Outside the magnet, they go from north to south. This forms closed loops.
Q46. The pattern of magnetic field around a straight conductor consists of:
The pattern of magnetic field around a straight current-carrying conductor consists of concentric circles centred on the wire. The circles are in a plane perpendicular to the wire.
Q47. Magnetic field lines form:
Magnetic field lines form closed curves. They emerge from the north pole, travel through space, enter the south pole, and continue inside the magnet from south to north, completing the loop.
Q48. Magnetic field around a straight wire is strongest:
The magnetic field around a straight wire is strongest at the wire itself. The field strength decreases as we move away from the wire. The field lines are closest together near the wire.
Q49. The magnetic field produced by current depends on the:
The magnetic field produced by current depends on the shape of the conductor (straight wire, circular loop, solenoid). It also depends on the current and the distance from the conductor.
Q50. Field lines never cross each other because:
Field lines never cross each other because if they did, a compass placed at the crossing point would point in two different directions, which is impossible. The magnetic field has a unique direction at each point.