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Class 12 Physics (Part I) Chapter 4 Moving Charges And Magnetism Quiz 1 (25 MCQs)

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1. Magnetic field at the centre of a coil is B. What will be new magnetic field if the current, no. of turns and radius of the coil all are doubled?
2. A wire of fixed length is turned to form a coil of one turn. It is again turned to form a coil of three turns. If in both cases same amount of current is passed, then the ratio of the intensities of magnetic field produced at the centre of a coil will be
3. The frequency of a charge particle revolving in a perpendicular uniform magnetic field is directly proportional to its velocity as
4. Electrons are (a)
5. In Biot-Savart law the direction of dB is always
6. SI unit of magnetic field is
7. This is rock or metal that creates an invisible field around themselves.
8. What causes magnetism?
9. A moving coil galvanometer can be converted into an ammeter by
10. Which of the following is a fundamental principle of electromagnetism related to moving charges?
11. Current sensitivity of a galvanometer can be increased by decreasing:
12. What is the principle of Moving Coil Galvanometer.
13. Assertion (A):When radius of circular loop carrying current is doubled, its magnetic moment becomes four times.Reason (R):Magnetic moment depends on area of the loop.
14. The deflecting torque acting on the coil of a galvanometer is
15. If two magnets are placed so that a north pole and a south pole are facing each other, they will ..... each other.
16. The magnetic field due to a very long straight wire carrying a current decreases as the square of the distance from the wire.
17. If distance between two current-carrying wires is doubled, then force between them is
18. There is no change in the as a charged particle moving in a magnetic field, although magnetic force is acting on it.
19. An electron is projected with uniform velocity along the axis of a current carrying long solenoid. Which of the following is true?
20. How can u convert MCG to voltmeter
21. Magnetism is a force of ..... that occurs between two ..... objects.
22. In a moving coil galvanometer, current in the coil is
23. Attractive and repulsive forces between objects due to electron arrangement
24. Their movement creates an electric current and causes each ..... to act like a microscopic magnet.
25. Certain materials respond to magnetic fields by becoming ..... themselves. ..... is one of these materials.
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