Posted by Here are some important multiple-choice questions (MCQs) based on Chapter 4: Moving Charges and Magnetism from Class 12 Physics:
1. What is the direction of the magnetic field at the center of a circular loop carrying current?
A. Parallel to the plane of the loop
B. Perpendicular to the plane of the loop
C. Tangential to the loop
D. Along the radius of the loop
Answer: B. Perpendicular to the plane of the loop
2. A straight conductor carrying current produces a magnetic field that is:
A. Parallel to the current
B. Radial
C. Circular around the conductor
D. Perpendicular to the conductor
Answer: C. Circular around the conductor
3. The SI unit of the magnetic field is:
A. Tesla
B. Weber
C. Ampere
D. Newton
Answer: A. Tesla
4. The magnetic field inside a long solenoid carrying current is:
A. Zero
B. Uniform
C. Stronger at the ends
D. Stronger at the center
Answer: B. Uniform
5. What is the value of the permeability of free space (μ0\mu_0μ0)?
A. 4π×10−7 N/A24 \pi \times 10^{-7} \, \text{N/A}^24π×10−7N/A2
B. 10−6 N/A210^{-6} \, \text{N/A}^210−6N/A2
C. 4π×10−9 N/A24 \pi \times 10^{-9} \, \text{N/A}^24π×10−9N/A2
D. 10−7 N/A210^{-7} \, \text{N/A}^210−7N/A2
Answer: A. 4π×10−7 N/A24 \pi \times 10^{-7} \, \text{N/A}^24π×10−7N/A2
6. The force between two parallel current-carrying conductors is:
A. Repulsive if the currents are in the same direction
B. Attractive if the currents are in the same direction
C. Attractive if the currents are in opposite directions
D. Zero for any direction of currents
Answer: B. Attractive if the currents are in the same direction
7. The torque (τ\tauτ) acting on a current loop in a magnetic field is given by:
A. τ=BIL\tau = BILτ=BIL
B. τ=IAB\tau = IABτ=IAB
C. τ=IABsinθ\tau = IAB \sin \thetaτ=IABsinθ
D. τ=BILsinθ\tau = BIL \sin \thetaτ=BILsinθ
Answer: C. τ=IABsinθ\tau = IAB \sin \thetaτ=IABsinθ
8. The force on a moving charge qqq in a magnetic field is given by:
A. F=q(E+vB)F = q(E + vB)F=q(E+vB)
B. F=qvBsinθF = qvB \sin \thetaF=qvBsinθ
C. F=qEF = qEF=qE
D. F=qvBcosθF = qvB \cos \thetaF=qvBcosθ
Answer: B. F=qvBsinθF = qvB \sin \thetaF=qvBsinθ
9. The magnetic field at a point due to an infinitely long straight current-carrying wire is proportional to:
A. Distance from the wire
B. Inverse of the distance from the wire
C. Square of the distance from the wire
D. Current squared
Answer: B. Inverse of the distance from the wire
10. Biot-Savart Law is used to calculate:
A. Electric field due to a charge distribution
B. Magnetic field due to a current element
C. Electric potential due to a point charge
D. Magnetic potential
Answer: B. Magnetic field due to a current element
11. The magnetic field at the center of a current-carrying circular loop is directly proportional to:
A. The radius of the loop
B. The square of the radius of the loop
C. The current passing through the loop
D. The cube of the radius of the loop
Answer: C. The current passing through the loop
12. The SI unit of the magnetic flux is:
A. Weber
B. Tesla
C. Newton
D. Joule
Answer: A. Weber
13. In the tangent galvanometer, the deflection angle is proportional to:
A. Square of the current
B. Current passing through the coil
C. Magnetic moment
D. Magnetic field
Answer: B. Current passing through the coil
14. Two parallel wires carrying currents in opposite directions:
A. Attract each other
B. Repel each other
C. Have no force acting between them
D. Produce zero magnetic field
Answer: B. Repel each other
15. The net magnetic field at a point on the axis of a current-carrying solenoid is:
A. Proportional to the square of the current
B. Zero
C. Parallel to the axis of the solenoid
D. Perpendicular to the axis of the solenoid
Answer: C. Parallel to the axis of the solenoid
These MCQs can be helpful for board exam preparation, competitive exams like JEE, NEET, and quick revision of key concepts.
- Rbse Class 12 Physics Chapter 6 mcqs: Electromagnetic Induction – NCERT Class 12 Physics
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- Class 12 Physics Chapter 1 Mcqs With Solution – Electric Charges and Fields
