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Class 12 Physics (Part I) Chapter 4 Moving Charges And Magnetism Quiz 3 (25 MCQs)

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1. Two a-particles have the ratio of their velocities as 3:2 on entering the field. If they move in different circular paths, then the ratio of the radii of their paths is
2. What you have when electrons move and allows things to move or work
3. The magnetic north pole of Earth is located in the same place as the geographic north pole of Earth
4. What is the equation for the force on a moving charge
5. A galvanometer has a resistance of 10 ohm and meter shows full scale deflection for a current of 4 mA. How will u convert the meter into an ammeter of range 0 to 6 A?
6. A wire in the form of a circular loop, of one turn carrying a current, produces magneticinduction B at the centre. If the same wire is looped into a coil of two turns and carries thesame current, the new value of magnetic induction at the centre is
7. In magnetic materials, all of the ..... are pointing in the same direction.
8. A charged particle is moving in a cyclotron, what effect on the radius of path of this charged particle will occur when the frequency of the ratio frequency field is doubled?
9. In moving coil galvanometer, the pole faces of U-shaped magnet are made concave
10. A current moving through a wire causes .....
11. F = qvB If the speed and charge double, what happens to the magnetic force?
12. A strong magnetic field is applied on a stationary electron. Then the electron
13. The material used in making of the suspension wire used in moving coil galvanometer should be of ..... torsional constant and ..... elastic constant.
14. The direction of force experienced by a current carrying conductor placed in a magnetic field is given by:
15. On Earth, where is Magnetic North approximately located?
16. If two magnets are close together, the magnetic force will be .....
17. Biot-Savart law indicates that the moving electrons (velocity $\upsilon$
18. How is an electromagnet different from a permanent magnet?
19. A moving coil galvanometer has N number of turns in a coil of effective area A, it carries a current I. The magnetic field B is radial. The torque acting on the coil is
20. A charged particle enters a magnetic field at a right angle of magnetic field. The path of the particle will be a/an
21. To convert a galvanometer to ammeter a shunt S is to be connected with the galvanometer. The effective resistance of the ammeter then is
22. Which among the following rules is applicable to study the direction of force, magnetic field and current at a same instant?
23. A circular coil of radius 10 cm is placed in X-Y plane, a constant current of 10 A is flowing in it in clockwise sense. The magnitude and direction of magnetic field at the centre are
24. A proton is moving in a magnetic field and experiences a force. Which of the following statements is true about the direction of this force?
25. A wire in the form of a circular loop, of one turn carrying a current, produces magnetic induction B at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is
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