Magnetism and Electromagnetic Induction MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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The magnetic field produced by a bar magnet is strongest:
A. At the poles
B. At the center
C. At the mid-point
D. At the edges
Answer: At the poles
The unit of self-inductance is:
A. Henry
B. Tesla
C. Ohm
D. Weber
Answer: Henry
The induced EMF in a coil is directly proportional to all of the following except:
A. The rate of change of magnetic flux
B. The number of turns in the coil
C. The magnetic field strength
D. The resistance of the coil
Answer: The resistance of the coil
The magnetic field strength is inversely proportional to:
A. The distance from the source
B. The current flowing through the source
C. The number of turns in a coil
D. The area of the coil
Answer: The distance from the source
The principle of operation of a moving coil galvanometer is based on:
A. Electromagnetic induction
B. Electrostatic induction
C. Capacitance
D. Magnetic resonance
Answer: Electromagnetic induction
The term ‘magnetic dipole’ refers to:
A. A pair of opposite magnetic poles separated by a distance
B. A single magnetic pole
C. A magnetic field line
D. A current-carrying coil
Answer: A pair of opposite magnetic poles separated by a distance
The force between two parallel current-carrying conductors is:
A. Proportional to the product of their currents
B. Inversely proportional to the distance between them
C. Proportional to the square of the distance between them
D. Independent of the distance between them
Answer: Proportional to the product of their currents
The direction of the induced current in a coil due to a changing magnetic field is such that:
A. It opposes the change in magnetic flux
B. It supports the change in magnetic flux
C. It has no relation to the change in magnetic flux
D. It accelerates the change in magnetic flux
Answer: It opposes the change in magnetic flux
The magnetic field inside a long solenoid is:
A. Uniform and parallel
B. Concentrated at the ends
C. Zero
D. Concentrated at the center
Answer: Uniform and parallel