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Class 12 Physics (Part I) Chapter 4 Moving Charges And Magnetism Quiz 5 (25 MCQs)

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1. What happens to the magnetic field around a wire if the current flowing through it is reversed?
2. Biot Savart law is used to find the magnetic field due to a current carrying
3. A charge moves in a circle inside a magnetic field.Time period of revolution is independent of mass of particle
4. Magnetic field at the centre of the current carrying circular coil varies
5. Moving a magnet next to a wire causes .....
6. A charged particle enters the magnetic field with velocity v and in the direction of magnetic field. Which of the following is true?
7. A positive charge is moving in combined gravitational and magnetic field. The charge moves without any change in velocity. If the velocity of charge is along east, then the direction of magnetic field is along
8. A positive charge with another positive charge (North with North or South with South) creates
9. An electron and a proton enter a magnetic field perpendicularly. Both have same kinetic energy. Which of the following is true?
10. In a certain region of space, electric field E and magnetic field B are perpendicular to each other. An electron enters perpendicularly to both the fields and moves undeflected. The velocity of electron is
11. A magnetic field is a field of force that is produced by moving ..... charges.
12. Why does current flowing through a wire create a magnetic field?
13. The sensitivity of a moving coil galvanometer can be increased by decreasing
14. A moving coil galvanometer can be converted into an voltmeter by
15. The strength of the magnetic field at distance r from a long straight current carrying wire is B. The field at a distance r/2 will be
16. What condition is necessary for an electric charge to have a magnetic field around it?
17. Magnetic field at the centre of a circular current-carrying conductor/coil is given by
18. When a magnetic compass needle is carried nearby to a straight wire carrying current, then(I) the straight wire cause a noticeable deflection in the compass needle.(II) the alignment of the needle is tangential to an imaginary circle with straight wire as its centre and has a plane perpendicular to the wire
19. Magnetic field at any point inside the straight solenoid is given as ..... Here the terms has their usual meanings.
20. Formula for figure of merit of galvanometer
21. If two magnets are placed so that two ..... poles or two ..... poles are facing each other, they will repel each other.
22. *. A conducting wire of linear mass density $\lambda$ is placed in a perpendicular magnetic field B. What should be the minimum value of the current passed through the wire so that it can hang freely in the magnetic field?
23. A long straight wire carrying a current induced magnetic induction at any place that is
24. A carrying circular loop of radius R is placed in the x-y plane with centre at the origin. Half of the loop with x > 0 is now bent so that it now lines in the y-z plane.
25. A solenoid has 1000 turns per metre length. If a current of 5A is flowing through it, then magnetic field inside the solenoid is
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