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Moving Charges and Magnetism Set-2

Test your knowledge on Moving Charges and Magnetism from Physics, Class 12.

Moving Charges and Magnetism is a core Class 12 Physics chapter that connects electricity with magnetism through the ideas of magnetic force on moving charges, magnetic fields due to currents, and motion of charged particles in magnetic fields. These concepts form the basis of many standard CBSE board questions and are repeatedly used in numericals involving Lorentz force, Biot–Savart law, Ampere’s circuital law, and force between current-carrying conductors.

This chapter is also crucial for understanding real devices and experiments such as cyclotrons, moving-coil galvanometers, current balance definition of ampere, and magnetic field mapping for common current geometries (wire, loop, solenoid, toroid). Mastery of key formulae, vector directions (right-hand rules), and typical approximations helps in scoring well in both CBSE board-level problems and JEE/NEET-aligned MCQs.

30

Minutes

30

Questions

1 / -0

Marking Scheme

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Questions in this Quiz

Q1: A charge qq moves with velocity v⃗\vec v in a uniform magnetic field B⃗\vec B. The magnetic force on it is maximum when the angle between v⃗\vec v and B⃗\vec B is:

  • 0∘0^\circ

  • 30∘30^\circ

  • 60∘60^\circ

  • 90∘90^\circ

Q2: A proton enters a uniform magnetic field B⃗\vec B with velocity v⃗\vec v perpendicular to B⃗\vec B. The path followed is:

  • Straight line

  • Parabola

  • Circle

  • Helix

Q3: The radius of circular path of a charged particle (charge qq, mass mm) moving with speed vv perpendicular to a uniform magnetic field BB is:

  • r=qBmvr=\dfrac{qB}{mv}

  • r=mvqBr=\dfrac{mv}{qB}

  • r=mBqvr=\dfrac{mB}{qv}

  • r=qvmBr=\dfrac{qv}{mB}

Q4: The time period of a charged particle in uniform circular motion in a magnetic field BB (with velocity perpendicular to BB) is:

  • T=2πmqBT=\dfrac{2\pi m}{qB}

  • T=2πqmBT=\dfrac{2\pi q}{mB}

  • T=2πmvqBT=\dfrac{2\pi mv}{qB}

  • T=2πmBqvT=\dfrac{2\pi mB}{qv}

Q5: A charged particle enters a uniform magnetic field with velocity having components v⊥v_\perp and v∥v_\parallel relative to B⃗\vec B. Its trajectory is:

  • Straight line along B⃗\vec B

  • Circle

  • Helix

  • Parabola

Q6: The pitch of the helical path of a charged particle moving in a uniform magnetic field is:

  • 2πmv⊥qB\dfrac{2\pi m v_\perp}{qB}

  • 2πmv∥qB\dfrac{2\pi m v_\parallel}{qB}

  • qBv∥2πm\dfrac{qB v_\parallel}{2\pi m}

  • 2πmqB\dfrac{2\pi m}{qB}

Q7: A charged particle moves in a uniform magnetic field. The work done by magnetic force on the particle is:

  • Maximum

  • Minimum but non-zero

  • Zero

  • Depends on speed

Q8: SI unit of magnetic field BB is:

  • Weber

  • Tesla

  • Henry

  • Coulomb

Q9: The magnetic field at a distance rr from a long straight wire carrying current II in free space is:

  • B=μ0I2πrB=\dfrac{\mu_0 I}{2\pi r}

  • B=μ0I4πrB=\dfrac{\mu_0 I}{4\pi r}

  • B=μ0Ir2πB=\dfrac{\mu_0 I r}{2\pi}

  • B=μ0I2πr2B=\dfrac{\mu_0 I}{2\pi r^2}

Q10: Two long parallel wires carry currents I1I_1 and I2I_2 in the same direction. The force between them is:

  • Repulsive

  • Attractive

  • Zero

  • Alternating between attractive and repulsive

...and 20 more questions.

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