Magnetism and Electromagnetic Induction MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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The magnetic field at the center of a long straight solenoid is:
A. Uniform and parallel to the axis of the solenoid
B. Concentrated at the ends
C. Zero outside the solenoid
D. Zero inside the solenoid
Answer: Uniform and parallel to the axis of the solenoid
The magnetic field produced by a current in a wire is:
A. Circular around the wire
B. Linear along the wire
C. Radial outward from the wire
D. Concentric inward toward the wire
Answer: Circular around the wire
The direction of the induced EMF is given by:
A. Lenz's Law
B. Faraday's Law
C. Ampere's Law
D. Biot-Savart Law
Answer: Lenz's Law
The force on a current-carrying conductor in a magnetic field is given by:
A. F = B I L sinθ
B. F = B I L cosθ
C. F = I B L
D. F = B / (I L)
Answer: F = B I L sinθ
The mutual inductance between two coils is proportional to:
A. The product of the number of turns and the coupling coefficient
B. The distance between the coils
C. The resistance of the coils
D. The temperature
Answer: The product of the number of turns and the coupling coefficient
The magnetic field at the center of a current-carrying loop is directed:
A. Perpendicular to the plane of the loop
B. Parallel to the plane of the loop
C. Radially outward from the loop
D. Radially inward toward the loop
Answer: Perpendicular to the plane of the loop
The magnetic field produced by a current-carrying wire is:
A. Proportional to the current and inversely proportional to the distance
B. Inversely proportional to the current
C. Directly proportional to the distance
D. Zero at the center of the wire
Answer: Proportional to the current and inversely proportional to the distance
The magnetic flux through a surface can be increased by:
A. Increasing the magnetic field strength or the area of the surface
B. Decreasing the magnetic field strength
C. Increasing the distance from the source
D. Decreasing the area of the surface
Answer: Increasing the magnetic field strength or the area of the surface
The principle of electromagnetic induction was discovered by:
A. Michael Faraday
B. James Clerk Maxwell
C. Henri Becquerel
D. André-Marie Ampère
Answer: Michael Faraday