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Class 12 Physics Chapter 4 - Moving Charges and Magnetism MCQ and Assertion Questions | CBSE Short Quiz

Question 1 of 5

CBSE Past Year 2026

An electron moves around the nucleus in a circular orbit of radius r and makes n revolutions per second. The value of equivalent current in the orbit is :

A \(\frac{e}{n}\) B ne C \(\frac{ne}{r}\) D \(\frac{e}{nr}\)

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Question 2 of 5

CBSE Past Year 2026

A galvanometer of resistance G is converted into a voltmeter of range (0 − V) by connecting a resistor of 250 Ω with it. If resistor of 250 Ω is replaced by another resistor of 900 Ω, its range becomes (0 − 3 V). The resistance G of the galvanometer is :

A 150 Ω B 125 Ω C 100 Ω D 75 Ω

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Question 3 of 5

CBSE Past Year 2026

Two particles of masses \(m_{1}\) and \(m_{2}\) having charges \(q_{1}\) and \(q_{2}\) respectively are projected with the same velocity in a region of uniform magnetic field \(\vec{B}\) pointing vertically upward. If they describe circular paths as shown in the figure, one may conclude that :

Diagram for question 2

A \(\frac{m_{1}}{m_{2}}\) > \(\frac{q_{1}}{q_{2}}\) B \(\frac{m_{1}}{m_{2}}\) > \(\frac{q_{2}}{q_{1}}\) C \(\frac{m_{1}}{m_{2}}\) < \(\frac{q_{1}}{q_{2}}\) D \(\frac{m_{1}}{m_{2}}\) < \(\frac{q_{2}}{q_{1}}\)

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Question 4 of 5

CBSE Past Year 2026

A long straight wire of circular cross-section (radius a) carries a steady current I. The current is uniformly distributed across this cross-section. The magnitude of the magnetic field produced at a point at a distance (a/2) from the axis of the wire will be

A Zero B \(\frac{μ_{0}I}{2πa}\) C \(\frac{μ_{0}I}{4πa}\) D \(\frac{μ_{0}I}{6πa}\)

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Question 5 of 5

CBSE Past Year 2026

A charged particle of mass m having kinetic energy K passes undeflected through a region with electric field \(\vec{E}\) and magnetic field \(\vec{B}\) acting perpendicular to each other. The mass m of the particle will be :

A \(\frac{KB^{2}}{2E^{2}}\) B \(\frac{2KB^{2}}{E^{2}}\) C \(\frac{2KE^{2}}{B^{2}}\) D \(\frac{KE^{2}}{2B^{2}}\)

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Class 12 Physics Chapter 4 - Moving Charges and Magnetism MCQ and Assertion Questions

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Class 12 Physics Chapter 4 - Moving Charges and Magnetism MCQ and Assertion Questions

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