Magnetism and Electromagnetic Induction MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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The force experienced by a moving charge in a magnetic field is called:
A. Lorentz force
B. Coulomb force
C. Gravitational force
D. Electrostatic force
Answer: Lorentz force
A changing magnetic field produces an electric field. This phenomenon is described by:
A. Faraday's law of induction
B. Gauss's law
C. Ampere's law
D. Newton's law
Answer: Faraday's law of induction
What is the principle behind a transformer?
A. Electromagnetic induction
B. Magnetic resonance
C. Electrolysis
D. Galvanic cell
Answer: Electromagnetic induction
The strength of the magnetic field at the center of a current-carrying circular loop is proportional to:
A. Current and the number of turns
B. Voltage and the radius
C. Resistance and the length
D. Current and the length
Answer: Current and the number of turns
The magnetic field around a straight current-carrying conductor forms:
A. Concentric circles
B. Straight lines
C. Ellipses
D. Spirals
Answer: Concentric circles
What does a galvanometer measure?
A. Current
B. Voltage
C. Magnetic field
D. Resistance
Answer: Current
The unit of magnetic field strength in the International System of Units (SI) is:
A. Tesla
B. Newton
C. Ampere
D. Joule
Answer: Tesla
In which direction does the magnetic field of a bar magnet point?
A. From the north pole to the south pole
B. From the south pole to the north pole
C. From the center to the edges
D. In all directions equally
Answer: From the north pole to the south pole
Lenz’s law states that the direction of the induced current will be such that it:
A. Opposes the change in magnetic flux
B. Supports the change in magnetic flux
C. Is perpendicular to the change in magnetic flux
D. Has no effect on the change in magnetic flux
Answer: Opposes the change in magnetic flux