NEET PhysicsNCERT Class 12Magnetic Effects of Current and Magnetism

Moving Charges and Magnetism: NEET questions with solutions

NEET tests the Lorentz force and circular or helical motion in a magnetic field, fields of wires, arcs, loops and solenoids, Ampere's law for thick wires, force between parallel currents, torque on a coil and galvanometer conversion. Marks are lost on the angle (plane of coil versus its normal), on mixing μ₀I/2πr with μ₀I/2R, and on forgetting that the magnetic force never changes a particle's speed.

Revise first: NCERT notes for Moving Charges and Magnetism

Questions

10 questions · answers after you pick

1A proton and an alpha-particle enter the same uniform magnetic field with equal speeds, moving at right angles to the field. Taking the…Motion in a magnetic fieldEasySingle correct 2A charged particle moves in a uniform magnetic field with its velocity perpendicular to the field, and no other force acts on it. Which…Magnetic field and the Lorentz forceEasySingle correct 3A proton (m = 1.67 × 10⁻²⁷ kg, q = 1.6 × 10⁻¹⁹ C) enters a uniform magnetic field of 0.10 T with a speed of 4.0 × 10⁵ m s⁻¹, its velocity…Motion in a magnetic fieldMediumSingle correct 4A wire carrying 4.0 A is bent into a quarter-circle arc of radius 10 cm, with straight leads running radially in and out of the arc's…Biot–Savart lawMediumSingle correct 5Two long straight parallel wires 5.0 cm apart in air carry currents of 10 A and 15 A in opposite directions. What is the force per metre…Force between parallel currentsMediumSingle correct 6A galvanometer of coil resistance 20 Ω gives full-scale deflection for a current of 5.0 mA. How should it be converted into a voltmeter of…The moving coil galvanometerMediumSingle correct 7A rectangular coil of 50 turns, 4.0 cm × 5.0 cm, carries a current of 2.0 A in a uniform magnetic field of 0.20 T. The plane of the coil…Torque on a current loopHardSingle correct 8Electrons of different speeds are injected perpendicular to the same uniform magnetic field. Read the Assertion (A) and Reason (R) about…Motion in a magnetic fieldMediumAssertion–Reason 9Match each current arrangement in List I with the magnitude of the magnetic field it produces (List II).Ampere's circuital lawEasyMatch the following 10A long straight solid wire of radius a carries a steady current distributed uniformly over its cross-section. What is the ratio of the…Ampere's circuital lawHardSingle correct

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