NEET Physics / AI question bank / NCERT Class 12 / Magnetic 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.
Also called: magnetic effect of current · Biot-Savart law · Ampere's law · cyclotron
Questions
10 questions / answers after you pick
- Q1A 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
- Q2A 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
- Q3A 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
- Q4A 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
- Q5Two 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
- Q6A 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
- Q7A 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
- Q8Electrons 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
- Q9Match each current arrangement in List I with the magnitude of the magnetic field it produces (List II).
Ampere's circuital lawEasyMatch the following
- Q10A 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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