Magnetism and Electromagnetic Induction MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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The induced EMF in a coil due to a changing magnetic field is:
A. Proportional to the rate of change of magnetic flux
B. Inversely proportional to the rate of change of magnetic flux
C. Independent of the rate of change of magnetic flux
D. Equal to the magnetic field strength
Answer: Proportional to the rate of change of magnetic flux
The force between two magnetic poles is:
A. Attractive if the poles are opposite and repulsive if the poles are the same
B. Always repulsive
C. Always attractive
D. Independent of the poles
Answer: Attractive if the poles are opposite and repulsive if the poles are the same
In which direction do the magnetic field lines emerge from a bar magnet?
A. North pole and enter at the south pole
B. South pole and enter at the north pole
C. Perpendicular to the poles
D. In all directions equally
Answer: North pole and enter at the south pole
What does a transformer do?
A. It changes the voltage of an alternating current
B. It converts mechanical energy into electrical energy
C. It measures the strength of a magnetic field
D. It stores electrical energy
Answer: It changes the voltage of an alternating current
The concept of ‘magnetic permeability’ refers to:
A. The ability of a material to conduct a magnetic field
B. The ability of a material to conduct an electric current
C. The resistance of a material to a magnetic field
D. The ability of a material to store electrical energy
Answer: The ability of a material to conduct a magnetic field
The magnitude of the force on a charged particle in a magnetic field is given by the equation:
A. F = qvB sin(θ)
B. F = qvB cos(θ)
C. F = qvB
D. F = qB
Answer: F = qvB sin(θ)
The direction of the magnetic field due to a current-carrying loop at the center is:
A. Perpendicular to the plane of the loop
B. Parallel to the plane of the loop
C. Tangential to the loop
D. Radial from the loop
Answer: Perpendicular to the plane of the loop
What is the primary principle behind electromagnetic induction?
A. A changing magnetic field induces an electric current
B. A changing electric field induces a magnetic field
C. A constant magnetic field induces a constant current
D. A constant electric field induces a magnetic field
Answer: A changing magnetic field induces an electric current
The phenomenon of mutual induction is observed in:
A. Two coils placed close to each other
B. A single coil with a changing current
C. A permanent magnet
D. An electromagnet in a solenoid
Answer: Two coils placed close to each other