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Class 12 Physics (Part I) Chapter 4 Moving Charges And Magnetism Quiz 3 (43 MCQs)

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1. A solenoid has 1000 turns per metre length. If a current of 5A is flowing through it, then magnetic field inside the solenoid is
2. What is the unit of magnetic field?
3. In which device is the principle of moving charges and magnetism used to convert electrical energy into mechanical energy?
4. If the beams of electrons and protons move parallel to each other in the same direction, then they
5. The small angle between magnetic axis and geographic axis at a place is
6. 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-
7. 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:
8. In a cyclotron, a charged particle
9. Which of the following is a correct statement about the magnetic field produced by a moving charge?
10. SI unit of the magnetic field 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. The path of charged particle moving perpendicular to B is X and the path of the charged particle making an angle $\theta$
19. The magnetic effects of electric current was discovered by
20. 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?
21. Moving charges, or an electric current, produces a magnetic field.
22. The Earth produces its own ..... field.
23. 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
24. The coil of a moving coil galvanometer is wound over a metal frame in order to
25. Magnetic field lines can sometimes cross.
26. An electron is projected with uniform velocity along the axis of a current carrying long solenoid. Which of the following is true? (a) The electron will be accelerated along the axis. (b) The electron path will be circular about the axis. (c) The electron will experience a force at 45$^\circ$ to the axis and hence execute a helical path. (d) The electron will continue to move with uniform velocity along the axis of the solenoid.
27. A wire is kept along north-south direction and a constant current is flowing in it in north to south direction. What will be the direction of the force on the wire if it is placed in constant magnetic field along west to east direction:
28. An ammeter gives full scale deflection when current of 1.0 A is passed in it. It is converted into a 100 A range ammeter, What will be the ratio of the shunt resistance and its resistance?
29. Most elements that are magnetic are .....
30. What is the direction of the magnetic field around a straight current-carrying conductor?
31. This is magnetism produced by electric currents or the interaction of electric and magnetic fields.
32. In Fleming's left hand rule, middle finger is used to show the direction of .....
33. To convert a moving coil galvanometer into on ammeter of given range, we must connect:
34. The ratio of voltage sensitivity ( $V_s$ $I_s$
35. If in a moving coil galvanometer, a current I in its coil produces a deflection $\theta$
36. Current sensitivity of a galvanometer is given by
37. What happens to the magnetic field strength if the current through a solenoid is doubled?
38. Assertion (A):An atom behaves as magnetic dipole.Reason (R):It is because, an atom contains equal positive & negative charges.
39. The direction of the force experienced by a charged particle entering perpendicular to the magnetic field?
40. In an experiment, a current-carrying wire is placed in a magnetic field. What happens to the wire?
41. An electric current passes through a long straight copper wire. At a distance 5 cm from the straight wire, the magnetic field is B. The magnetic field at 20 cm from the straight wire would be
42. A charged particle moves through a magnetic field in a direction perpendicualr to it. Then the
43. Electric current flows through a wire.Magnetic field on its surfacce
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