Magnetism and Electromagnetic Induction MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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Which type of current is used in transformers?
A. Alternating current
B. Direct current
C. Pulsating current
D. Static current
Answer: Alternating current
The magnetic field strength inside a current-carrying solenoid is directly proportional to:
A. The current and the number of turns per unit length
B. The length of the solenoid
C. The temperature of the solenoid
D. The diameter of the solenoid
Answer: The current and the number of turns per unit length
The phenomenon where a magnetic field induces an electric field is described by:
A. Faraday's law of induction
B. Ampere's law
C. Lenz's law
D. Maxwell's equations
Answer: Faraday's law of induction
What is the unit of magnetic flux density?
A. Tesla
B. Weber
C. Henry
D. Ohm
Answer: Tesla
The force experienced by a current-carrying conductor in a magnetic field is:
A. F = I × B × L
B. F = I × R
C. F = B × L
D. F = V × R
Answer: F = I × B × L
The self-inductance of a coil depends on:
A. The number of turns and the core material
B. The voltage applied to the coil
C. The temperature of the coil
D. The length of the coil
Answer: The number of turns and the core material
The force on a current-carrying conductor in a magnetic field is maximized when the angle between the conductor and the magnetic field is:
A. 90 degrees
B. 0 degrees
C. 45 degrees
D. 180 degrees
Answer: 90 degrees
What is the role of the core material in an electromagnet?
A. To enhance the magnetic field strength
B. To reduce the electrical resistance
C. To insulate the coils
D. To increase the mechanical strength
Answer: To enhance the magnetic field strength
The term ‘eddy currents’ refers to:
A. Circulating currents induced in a conductor by a changing magnetic field
B. Currents induced by a constant magnetic field
C. Current flowing in a closed circuit
D. Residual currents in an electrical appliance
Answer: Circulating currents induced in a conductor by a changing magnetic field