Magnetism and Electromagnetic Induction MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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The principle of operation of an electric motor is based on:
A. The force on a current-carrying conductor in a magnetic field
B. Electromagnetic induction
C. Magnetic flux
D. Capacitive reactance
Answer: The force on a current-carrying conductor in a magnetic field
The rate of change of current in an inductor is related to:
A. The induced EMF
B. The magnetic field strength
C. The resistance of the inductor
D. The capacitance of the inductor
Answer: The induced EMF
The magnetic field lines outside a bar magnet are directed:
A. From the north pole to the south pole
B. From the south pole to the north pole
C. Radially outward from the magnet
D. In closed loops around the magnet
Answer: From the north pole to the south pole
The phenomenon where a magnetic field is created by a current-carrying conductor is described by:
A. Ampere's Law
B. Faraday's Law
C. Lenz's Law
D. Gauss's Law
Answer: Ampere's Law
The induced EMF in a coil is given by:
A. ε = -dΦ/dt
B. ε = dΦ/dt
C. ε = B × A × sin(θ)
D. ε = B × A × cos(θ)
Answer: ε = -dΦ/dt
The force on a current-carrying conductor in a magnetic field can be increased by:
A. Increasing the current
B. Decreasing the length of the conductor
C. Decreasing the magnetic field strength
D. Decreasing the angle between the conductor and the magnetic field
Answer: Increasing the current
The unit of inductance is:
A. Henry
B. Tesla
C. Weber
D. Ohm
Answer: Henry
The magnetic flux through a surface is given by:
A. Φ = B × A × cos(θ)
B. Φ = B × A × sin(θ)
C. Φ = B × A
D. Φ = B × cos(θ)
Answer: Φ = B × A × cos(θ)
The principle behind a transformer is based on:
A. Electromagnetic induction
B. Electrostatic induction
C. Capacitance
D. Magnetic resonance
Answer: Electromagnetic induction