Moving Charges and Magnetism MCQs for NEET Physics with Answers

Moving Charges and Magnetism MCQs: When preparing for the NEET (National Eligibility cum Entrance Test), understanding Chapter 4 of Class 12 Physics, Moving Charges and Magnetism, is crucial. This chapter covers how moving electric charges interact with magnetic fields. To do well in the NEET, it is very helpful to practice with multiple-choice questions (MCQs) from this chapter. This article will discuss different aspects of MCQs related to Moving Charges and Magnetism, including their importance, and preparation tips.

Moving Charges and Magnetism MCQs

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Moving Charges and Magnetism NEET Questions

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Moving Charges and Magnetism MCQs with Answers

Q 1. Assertion (A): A compass needle is placed near a current-carrying wire. The deflection of the compass needle decreases when the magnitude of an electric current in the wire is increased.

Q 2. A current is flowing in an electricity line towards the north, the direction of the magnetic field at a point which is just below the line is;

Q 3. A current of 10 A is established in a long wire along a positive z-direction. The magnetic field B at the point (1 m, 0, 0) is;

Q 4. Two equal electric currents are flowing perpendicular to each other in two straight long wires as shown. Lines AB and CD are perpendicular to each other and symmetrically placed with respect to the currents. Where do we expect the resultant magnetic field to be zero?

Q 5. Following is a square-shaped loop, whose one-arm CD produces magnetic field B at the center of the coil. The resultant magnetic field due to all the arms will be;

Q 6. Assertion (A): A current element is a source of magnetic field.

Reason (R): A moving charge is a source of the magnetic field.

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Q 7. 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;

Q 8. Two long parallel conductors carry currents in opposite directions as shown. One conductor carries a current of 10 A and the distance between the wires is d = 10 cm. Current I is adjusted so that the magnetic field at P which is at a distance of 5 cm to the right of 10 A current is zero. Value of I is;

Q 9. Two parallel conductors A and B separated by 5 cm carry an electric current of 6 A and 2 A in the same direction. The point between A and B where the field is zero;

Q 10. The value of I so that the magnetic field at R is zero.

Q 11. A length of wire carries a steady current and is bent first to form a plane circular coil of one turn, the same length now bent more sharply to give four turns of smaller radius. Magnetic field becomes;

Q 12. The magnetic field at the center of a circular coil carrying current I is B. If the coil is bent into a smaller circular coil of n turns, then its magnetic field at the center is B′. The ratio of B′ and B is;

Q 14. Two coils X and Y having the same number of turns, carrying the same current, and in the same sense are arranged coaxially so that they subtend the same solid angle at point O. If the smaller coil is midway between the larger coil and the point O, then the ratio of the magnetic fields at O due to the two coils is

Q 15. A battery is connected between two points A and B on a uniform conducting ring of radius r and resistance R. One of the arcs AB of the ring subtends an angle θ at the center. The value of the magnetic field at the center due to the current in the ring is

Q 16. Two infinitely long, thin, insulated, straight wires lie in the x-y plane along the x and y-axes. Each wire carries a current I, respectively in the positive x-direction and positive y-direction. The magnetic field will be zero at all points on the straight line;

Q 17. Two circular coils 1 and 2 are made from the same wire but the radius of the 1st coil is twice that of the 2nd coil. What is the ratio of the potential difference applied across them so that the magnetic field at their centers is the same? (2006)

Q 18. A current-carrying coil (I = 5A, R = 10 cm) having 50 number of turns finds a field at its center:

Q 19. Only the current inside the American loop contributes in;

Q 20. In a coaxial straight cable, the central solid conductor and the outer conductor carry equal currents in opposite directions. The magnetic field is zero. (Assume current is uniformly distributed);

Q 21. A current flows along the length of an infinitely long straight and thin-walled pipe. Then;

Q 22. A solid cylindrical wire of radius ‘R’ carries a current I. The ratio of magnetic fields at points which are located at R/3 and 3R distance away from the axis of the wire;

Q 23. Ampere’s circuital law is conveniently used to determine the field of a solenoid or toroid as

Q 24. A ring of mean radius 15 cm has 3500 turns of wire wound on a ferromagnetic core of relative permeability 800. The magnetic field in the core for a magnetizing current of 1.2 A is

Q 25. The magnetic field inside a toroidal solenoid of radius R is B. If the current through it is doubled and its radius is also doubled keeping the number of turns per unit length the same, the magnetic field produced by it will be;

Q 26. Two toroids 1 and 2 have a total number of turns 200 and 100 respectively with average radii of 40 cm and 20 cm respectively. If they carry the same current I, the ratio of the magnetic fields along the two loops is;

Q 27. If the number of turns and current becomes double for any long solenoid, then the value of the magnetic field becomes;

Q 28. A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per meter is halved, the new value of the magnetic field is;

Q 29. Currents flowing in a solenoid and a toroid are 2i and 6i respectively. If the number of turns per unit length is 2n and n respectively. Find the ratio of the magnetic field inside the core due to solenoid and toroid.

Q 30. The current flowing in a solenoid and a toroid is i and 4i respectively. If the number of turns per unit length is 3n and n respectively. Find the ratio of the magnetic field inside the core due to solenoid and toroid.

Q 31. Two toroids A and B have the total number of turns 3n and n respectively with average radii r and 3r respectively. If both toroids carry equal amounts of current, the ratio of the magnetic field inside the core of the toroids is

Q 32. The core of a toroid having 3000 turns has inner and outer radii 11 cm and 12 cm respectively. The magnetic field in the core for a current of 0.7 A is 2.5 T. Calculate the relative permeability of the core.

Q 33. A toroidal solenoid has 3000 turns and a mean radius of 10 cm. It has a soft iron core with a relative permeability of 2000. What is the magnitude of the magnetic field in the core when a current of 1 A is passed through the toroid?

Q 34. Under the influence of a uniform magnetic field, a charged particle moves with constant speed V in a circle of radius R. The time period of rotation of the particle;

Q 35. If the direction of the initial velocity of the charged particle is neither along nor perpendicular to that of the uniform magnetic field, then the path of the charged particle will be;

Q 36. When α and b rays are subjected to a uniform magnetic field that is perpendicular to the direction of their motion, with the same speed. The curvature of the path of both particles are;

Q 37. If a positively charged particle is moving as shown in the figure, then it will get deflected due to the magnetic field Towards;

Assertion (A): In a uniform magnetic field, speed, and energy remain the same for a charged particle moving in a circular path.

Reason (R): A moving charged particle experiences magnetic force perpendicular to its direction of motion.

Q 39. A proton and an alpha particle of the same velocity enter a uniform magnetic field which is acting perpendicular to their direction of motion. The ratio of radii of the circular paths described by the alpha particle and proton are;

Q 40. A proton, a deuteron, and an α-particle enter a uniform magnetic field perpendicular to the field with the same velocity. What is the ratio of the radii of their circular paths?

Q 41. A charge q is moving in a uniform magnetic field. The magnetic force acting on it does not depend upon;

Q 42. Assertion (A): If a proton and α-particle enter a uniform magnetic field perpendicularly, with the same speed, then the time period of revolution of the α-particle is double that of the proton.

Reason (R): In a magnetic field, the time period of the revolution of a charged particle is directly proportional to mass and inversely proportional to charge.

Q 43. A neutron, a proton, an electron, and an α-particle enter a region of uniform magnetic field with equal velocities. The magnetic field is perpendicular and directed into the paper. The track of the particles is labeled as in the figure below. The electron follows the track;

Q 44. A moving charge will gain kinetic energy due to the application of;

Q 45. A charged particle enters a uniform magnetic field B with its initial velocity making an angle of 45° with B. The path of the particle will be;

Q 46. A proton of mass ‘m’ and charge ‘e’ is fired parallel to a uniform magnetic field of induction ‘B’. The radius of curvature of the path of the particle in the field is;

Q 47. When a charged particle moves at right angles to a magnetic field then which of the following quantities changes;