Magnetism and Electromagnetic Induction MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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The rate at which magnetic flux is linked with a coil is known as:
A. Magnetic flux
B. Magnetic flux density
C. Inductance
D. Electromagnetic induction
Answer: Magnetic flux
The term ‘magnetic flux density’ is synonymous with:
A. Magnetic induction
B. Magnetic susceptibility
C. Magnetic permeability
D. Magnetic field strength
Answer: Magnetic induction
The unit of magnetic field strength is:
A. Tesla
B. Henry
C. Weber
D. Ohm
Answer: Tesla
The magnetic field strength of the Earth is:
A. About 0.5 Gauss
B. About 5 Gauss
C. About 50 Gauss
D. About 500 Gauss
Answer: About 0.5 Gauss
The mutual inductance between two coils is defined as:
A. The ratio of the induced EMF in one coil to the rate of change of current in the other coil
B. The ratio of the magnetic field strength to the distance between the coils
C. The ratio of the current in the coils to the induced EMF
D. The ratio of the magnetic flux through one coil to the current in the other coil
Answer: The ratio of the induced EMF in one coil to the rate of change of current in the other coil
The phenomenon of self-inductance occurs when:
A. A changing current in a coil induces an EMF in the same coil
B. A changing magnetic field induces an EMF in a nearby coil
C. A coil is placed in a static magnetic field
D. A coil is connected to a capacitor
Answer: A changing current in a coil induces an EMF in the same coil
The inductance of a coil is defined as:
A. The ratio of the induced EMF to the rate of change of current
B. The ratio of the magnetic field strength to the current
C. The ratio of the resistance to the length of the coil
D. The ratio of the voltage to the current
Answer: The ratio of the induced EMF to the rate of change of current
The magnetic field produced by a current-carrying conductor can be detected using:
A. A compass
B. A voltmeter
C. A galvanometer
D. An ammeter
Answer: A compass
The magnetic field lines due to a bar magnet are:
A. Closed loops
B. Straight lines
C. Spirals
D. Randomly oriented
Answer: Closed loops