Magnetism and Electromagnetic Induction MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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In a moving conductor within a magnetic field, the induced EMF is maximized when:
A. The conductor moves perpendicular to the magnetic field
B. The conductor moves parallel to the magnetic field
C. The magnetic field is minimized
D. The conductor is at rest
Answer: The conductor moves perpendicular to the magnetic field
The magnetic field lines inside a current-carrying solenoid are:
A. Parallel and equidistant
B. Concentric circles
C. Radial lines
D. Spiral lines
Answer: Parallel and equidistant
The magnetic field due to a current-carrying straight wire decreases with:
A. Increasing distance from the wire
B. Decreasing distance from the wire
C. Increasing current
D. Decreasing current
Answer: Increasing distance from the wire
The phenomenon where a changing magnetic field induces an electric current in a conductor is called:
A. Electromagnetic induction
B. Magnetic resonance
C. Electrostatic induction
D. Magnetic polarization
Answer: Electromagnetic induction
What does the term ‘self-inductance’ refer to?
A. The induction of an EMF in a coil due to its own changing current
B. The induction of an EMF in a coil due to an external magnetic field
C. The change in the magnetic field strength with distance
D. The ability of a conductor to conduct electricity
Answer: The induction of an EMF in a coil due to its own changing current
The magnetic flux through a surface is maximized when:
A. The magnetic field is perpendicular to the surface
B. The magnetic field is parallel to the surface
C. The magnetic field is at an angle of 45 degrees to the surface
D. The surface area is minimized
Answer: The magnetic field is perpendicular to the surface
The magnetic field at the center of a current-carrying solenoid is:
A. Uniform and parallel
B. Concentrated at the ends
C. Weak and irregular
D. Zero inside
Answer: Uniform and parallel
The force between two parallel current-carrying wires is:
A. Directly proportional to the current and inversely proportional to the distance
B. Inversely proportional to the current and directly proportional to the distance
C. Directly proportional to the distance and inversely proportional to the current
D. Independent of the current and distance
Answer: Directly proportional to the current and inversely proportional to the distance
The induced EMF in a coil is directly proportional to the:
A. Rate of change of magnetic flux
B. Size of the coil
C. Resistance of the coil
D. Current in the coil
Answer: Rate of change of magnetic flux