Magnetism and Electromagnetic Induction MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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The energy stored in a magnetic field 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 mutual inductance between two coils is:
A. The ability of one coil to induce an EMF in another
B. The property of a coil to oppose changes in current
C. The resistance of a coil to the flow of current
D. The strength of the magnetic field produced by the coils
Answer: The ability of one coil to induce an EMF in another
The magnetic field due to a solenoid is concentrated:
A. Inside the solenoid
B. Outside the solenoid
C. At the ends of the solenoid
D. Along the length of the solenoid
Answer: Inside the solenoid
The magnetic field lines outside a bar magnet:
A. Run from the north pole to the south pole
B. Run from the south pole to the north pole
C. Are circular
D. Are radial from the north pole
Answer: Run from the north pole to the south pole
The right-hand rule for magnetic fields indicates the direction of:
A. The magnetic field around a current-carrying wire
B. The induced EMF in a moving conductor
C. The magnetic field due to a magnetic dipole
D. The force on a current-carrying wire in a magnetic field
Answer: The magnetic field around a current-carrying wire
The self-inductance of a coil is a measure of:
A. The coil's opposition to changes in current
B. The coil's ability to induce EMF in another coil
C. The resistance of the coil
D. The magnetic field strength around the coil
Answer: The coil's opposition to changes in current
The force experienced by a moving charge in a magnetic field is given by:
A. qvB sinθ
B. qvB cosθ
C. qB / v
D. q / vB
Answer: qvB sinθ
The magnetic field due to a current-carrying loop is:
A. Stronger at the center
B. Stronger at the edges
C. Uniform throughout
D. Zero at the center
Answer: Stronger at the center
The magnetic field inside a toroid is:
A. Uniform and confined within the core
B. Concentrated outside the core
C. Zero inside the core
D. Stronger outside the core
Answer: Uniform and confined within the core