Magnetism and Electromagnetic Induction MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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The magnetic field due to a current-carrying wire is given by:
A. B = μ0 I / (2πr)
B. B = μ0 I r / (2π)
C. B = I / (μ0 2πr)
D. B = μ0 r / (2π I)
Answer: B = μ0 I / (2πr)
The term ‘magnetic flux density’ is often used interchangeably with:
A. Magnetic induction
B. Magnetic field strength
C. Magnetic susceptibility
D. Magnetic permeability
Answer: Magnetic induction
The force between two current-carrying conductors is:
A. Directly proportional to the product of their currents and inversely proportional to the distance between them
B. Inversely proportional to the product of their currents
C. Directly proportional to the distance between them
D. Directly proportional to the difference in their currents
Answer: Directly proportional to the product of their currents and inversely proportional to the distance between them
The phenomenon of electromagnetic induction is best described by:
A. Faraday's Law
B. Lenz's Law
C. Ampere's Law
D. Maxwell's Equations
Answer: Faraday's Law
The magnetic flux through a closed surface is:
A. Zero
B. Equal to the magnetic flux density
C. Proportional to the surface area
D. Dependent on the magnetic field strength
Answer: Zero
The energy stored in the magnetic field of an inductor is:
A. 1/2 L I^2
B. 1/2 C V^2
C. 1/2 m v^2
D. L I
Answer: 1/2 L I^2
The torque experienced by a current-carrying coil in a magnetic field is given by:
A. μ B I A sinθ
B. B I A cosθ
C. B I A sinθ
D. μ I A cosθ
Answer: μ B I A sinθ
The phenomenon of magnetic flux linkage is used in:
A. Transformers
B. Capacitors
C. Resistors
D. Diodes
Answer: Transformers
The magnetic field strength inside a long solenoid is proportional to:
A. The number of turns per unit length and the current
B. The length of the solenoid
C. The magnetic flux
D. The temperature
Answer: The number of turns per unit length and the current