Magnetism and Electromagnetic Induction MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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The magnetic field strength at the center of a circular loop of wire is:
A. B = (μ0 I) / (2 R)
B. B = μ0 I R
C. B = (μ0 I) / (π R)
D. B = (μ0 I) / (4 R)
Answer: B = (μ0 I) / (2 R)
The unit of magnetic field intensity is:
A. Ampere per meter
B. Tesla
C. Weber
D. Henry
Answer: Ampere per meter
The magnetic field due to a current in a straight wire decreases with:
A. Increasing distance from the wire
B. Increasing current
C. Increasing temperature
D. Increasing resistance
Answer: Increasing distance from the wire
The phenomenon of mutual inductance is observed when:
A. A change in current in one coil induces EMF in another coil
B. A changing magnetic field induces EMF in the same coil
C. A coil is placed in a magnetic field
D. An electric field induces EMF in a coil
Answer: A change in current in one coil induces EMF in another coil
The energy stored in a magnetic field of an inductor is proportional to:
A. The square of the current
B. The voltage across the inductor
C. The resistance of the inductor
D. The inductance of the inductor
Answer: The square of the current
The magnetic flux through a surface is given by the product of:
A. Magnetic field strength and the area of the surface
B. Electric field strength and the area of the surface
C. Current and resistance
D. Voltage and time
Answer: Magnetic field strength and the area of the surface
The induced EMF in a coil due to a changing magnetic field is proportional to:
A. The rate of change of magnetic flux
B. The magnetic field strength
C. The resistance of the coil
D. The length of the coil
Answer: The rate of change of magnetic flux
The magnetic field inside a long straight solenoid is:
A. Uniform and parallel to the axis
B. Concentrated at the ends
C. Zero inside
D. Concentrated outside
Answer: Uniform and parallel to the axis
The right-hand rule for a current-carrying wire helps to determine:
A. The direction of the magnetic field
B. The direction of the current
C. The magnitude of the magnetic field
D. The force on a moving charge
Answer: The direction of the magnetic field