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Class 12 Physics (Part I) Chapter 4 Moving Charges And Magnetism Quiz 6 (25 MCQs)

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1. What is the unit of magnetic field?
2. In which device is the principle of moving charges and magnetism used to convert electrical energy into mechanical energy?
3. If the beams of electrons and protons move parallel to each other in the same direction, then they
4. The small angle between magnetic axis and geographic axis at a place is
5. An electric current is traveling in a wire. A compass is placed under the wire with the current flowing from north to south. In response, the compass needle will-
6. A constant current I is flowing in a long solid cylindrical rod of radius R. The ratio of magnetic fields at the perpendicular distances R/2 and 3R/2 from the axis of the wire:
7. In a cyclotron, a charged particle
8. Which of the following is a correct statement about the magnetic field produced by a moving charge?
9. SI unit of the magnetic field is .....
10. A solenoid has 1000 turns per meter length. If a current of 5A is flowing through it, then magnetic field inside the solenoid is
11. A deuteron of kinetic energy 50 keV is describing a circular orbits of radius 0.5 m in a plane perpendicular to the magnetic field B. The kinetic energy of the proton that describes a circular orbit of same radius and inside same B is
12. What part of the atom is responsible for electricity?
13. Which rule gives the direction of magnetic force on a charged particle moving in a magnetic field?
14. Currents of 10 A and 2 A are flowing in opposite directions through two parallel wires A andB respectively. If the wire A is infinitely long and wire B is 2 m long, then force on wire Bwhich is situated at 10 cm from A, is
15. A proton and an electron traveling along parallel paths enter a region of the uniform magnetic field, acting perpendicular to their paths. Which of them will move in a circular path with a higher frequency?
16. An electrical current flows down the power line. What type of force would the flow of the current produce around the power line?
17. An electron passes undeflected when passes through a region with electric and magneticfields. When electric field is switched off its path will change to
18. A charged particle is moving on circular path with velocity v in a uniform magnetic field B, if the velocity of the charged particle is doubled and strength of magnetic field is halved, then radius
19. The path of charged particle moving perpendicular to B is X and the path of the charged particle making an angle $\theta$
20. The magnetic effects of electric current was discovered by
21. Moving a magnet near a compass can cause the compass needle to move, even though the magnet does not touch the compass. This observation is evidence for which characteristics of magnetic fields?
22. Moving charges, or an electric current, produces a magnetic field.
23. The Earth produces its own ..... field.
24. A charge particle is moving undeflected in a uniform electric and magnetic fields, now the magnetic field is switched off, the trajectory of the particle will be
25. The coil of a moving coil galvanometer is wound over a metal frame in order to
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