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Moving Charges and Magnetism Set-1

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

The chapter "Moving Charges and Magnetism" is a cornerstone of Electromagnetism in the Class 12 Physics syllabus. It bridges the gap between static electricity and magnetism, explaining how moving charges generate magnetic fields and how these fields, in turn, exert forces on other moving charges and currents. For CBSE board exams, this chapter carries significant weightage, often featuring a mix of conceptual MCQs, derivation-based questions, and numerical problems related to the Biot-Savart Law and Ampere’s Circuital Law.

Mastering this chapter is essential for understanding advanced topics like Electromagnetic Induction and Alternating Currents. Students should focus on the vector nature of magnetic forces, the motion of charged particles in uniform magnetic fields, and the functional principles of the Moving Coil Galvanometer. This practice set is designed to test your proficiency in these areas, aligning strictly with the NCERT curriculum and the 2024-25 CBSE examination pattern.

30

Minutes

30

Questions

1 / -0

Marking Scheme

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Questions in this Quiz

Q1: A charged particle is moving through a uniform magnetic field. Which of the following quantities of the particle will NOT change?

  • Velocity

  • Momentum

  • Kinetic Energy

  • Acceleration

Q2: The magnetic field at the center of a circular current-carrying loop of radius RR is BB. What will be the magnetic field at the center if the radius is doubled and the current is halved?

  • B/4B/4

  • B/2B/2

  • 2B2B

  • 4B4B

Q3: According to the Biot-Savart law, the magnetic field dB⃗d\vec{B} due to a current element Idl⃗Id\vec{l} at a distance r⃗\vec{r} is proportional to:

  • dl⃗×r⃗r\frac{d\vec{l} \times \vec{r}}{r}

  • dl⃗⋅r⃗r3\frac{d\vec{l} \cdot \vec{r}}{r^3}

  • dl⃗×r⃗r3\frac{d\vec{l} \times \vec{r}}{r^3}

  • dl⃗×r⃗r2\frac{d\vec{l} \times \vec{r}}{r^2}

Q4: A proton and an alpha particle enter a uniform magnetic field with the same velocity perpendicular to the field. The ratio of the radii of their circular paths rp:rαr_p : r_\alpha is:

  • 1 : 2

  • 2 : 1

  • 1 : 1

  • 1 : 4

Q5: Two long parallel wires carrying currents in the same direction will:

  • Repel each other

  • Attract each other

  • Neither attract nor repel

  • Rotate each other

Q6: The S.I. unit of magnetic permeability μ0\mu_0 is:

  • T⋅m⋅A−1T \cdot m \cdot A^{-1}

  • T⋅m−1⋅AT \cdot m^{-1} \cdot A

  • T⋅m⋅AT \cdot m \cdot A

  • T⋅A⋅m−2T \cdot A \cdot m^{-2}

Q7: A solenoid of length 0.50.5 m and radius 11 cm has 500500 turns. If a current of 55 A flows through it, the magnetic field inside the solenoid is:

  • 6.28×10−36.28 \times 10^{-3} T

  • 3.14×10−33.14 \times 10^{-3} T

  • 6.28×10−56.28 \times 10^{-5} T

  • 2.15×10−22.15 \times 10^{-2} T

Q8: A current-carrying loop placed in a uniform magnetic field experiences a maximum torque when the angle between the area vector and the magnetic field is:

  • 0∘0^\circ

  • 45∘45^\circ

  • 90∘90^\circ

  • 180∘180^\circ

Q9: The sensitivity of a moving coil galvanometer can be increased by:

  • Decreasing the number of turns

  • Decreasing the area of the coil

  • Increasing the magnetic field

  • Increasing the torsional constant of the spring

Q10: To convert a galvanometer of resistance GG into an ammeter of range nIgnI_g, the required shunt resistance SS is:

  • G/(n−1)G/(n-1)

  • G/nG/n

  • G(n−1)G(n-1)

  • nGnG

...and 20 more questions.

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