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

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1. The unit of magnetic moment is
2. Regions around a magnet, where the force of magnetism acts.
3. In a certain region of space, electric field E and magnetic field B are perpendicular to eachother. An electron enters perpendicularly to both the fields and moves undeflected. The velocity of electron is
4. The path described by a charged particle entering perpendicular to the magnetic field is
5. What is the effect on a charged particle moving in a magnetic field if its velocity is parallel to the field lines?
6. The Earth is a large magnet, what are the two poles that attract solar energy?
7. What happens to the magnetic field at the centre of a circular current carrying coil if we double the radius of the coil keeping the current unchanged?
8. What is the principle of MCG
9. A constant current 10 A is flowing in a long conducting wire, the magnitude of the magnetic field due to the wire at a distance 100 m along the axis of the wire is
10. A particle carrying a charge of +e travels in a circular path in a uniform magnetic field. If instead the particle carried a charge of +2e, the radius of the circular path would have been .....
11. The conversion of a moving coil galvanometer into a voltmeter is done by
12. When a charged particle moves through a magnetic field perpendicular to its direction. Then
13. Which rule is used to determine the direction of the magnetic field around a current-carrying wire?
14. Static charge is source of A and moving charge is a source of B. A and B are
15. Which of the following statements is not true regarding Biot-Savart's law
16. Assertion (A):The true geographic north direction is found by using a compass needle.Reason (R):The magnetic meridian of the earth is along the axis of rotation of the earth.
17. In a cyclotron, charged particles are accelerated by a magnetic field. What is the primary purpose of the magnetic field in this device?
18. Lorentz Force generally refers to
19. In a certain region of space, electric fieldE and magnetic fieldB are perpendicular to each other. An electron enters perpendicularly to both the fields and moves undeflected. The velocity of electron is
20. Correct unit of magnetic field is
21. A length L of wire caries a steady current I. It is bent first to form a circular plane coil of one turn. A current I flowing through it produces a magnetic field B at the centre of the coil. The same length is now bent more sharply to form a double loop of smaller radius. the magnetic field at the centre caused by the same current is
22. How are the two forces that make up electromagnetic forces related?
23. The path described by the charged particle entering magnetic field with an angle other than 90 is
24. Probably the most useful thing about electromagnets is that they can be turned ..... and .....
25. Magnetic field due to a straight solenoid at any point inside it $B=\mu_0ni$
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