Magnetism and Electromagnetic Induction MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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The strength of the induced EMF in a coil is increased by:
A. Increasing the rate of change of magnetic flux
B. Increasing the length of the coil
C. Decreasing the number of turns
D. Increasing the resistance of the coil
Answer: Increasing the rate of change of magnetic flux
The magnetic field due to a solenoid can be increased by:
A. Increasing the number of turns per unit length
B. Decreasing the length of the solenoid
C. Increasing the resistance of the wire
D. Decreasing the current
Answer: Increasing the number of turns per unit length
The right-hand rule helps determine:
A. The direction of the magnetic field around a current-carrying conductor
B. The direction of the induced EMF in a moving conductor
C. The direction of the force on a moving charge in a magnetic field
D. The polarity of a magnet
Answer: The direction of the magnetic field around a current-carrying conductor
The magnetic field at the center of a current-carrying circular loop is:
A. Directly proportional to the current and inversely proportional to the radius
B. Directly proportional to the radius and inversely proportional to the current
C. Directly proportional to the square of the current
D. Inversely proportional to the square of the radius
Answer: Directly proportional to the current and inversely proportional to the radius
The energy stored in a magnetic field of an inductor 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 principle of operation of an electric transformer is based on:
A. Faraday's Law of Electromagnetic Induction
B. Lenz's Law
C. Ampere's Law
D. Gauss's Law
Answer: Faraday's Law of Electromagnetic Induction
The term ‘magnetic dipole moment’ refers to:
A. The product of the current and the area of the loop
B. The product of the magnetic field strength and the area of the loop
C. The strength of a magnet
D. The total magnetic flux through the coil
Answer: The product of the current and the area of the loop
The magnetic flux through a loop is maximum when:
A. The magnetic field is perpendicular to the plane of the loop
B. The magnetic field is parallel to the plane of the loop
C. The magnetic field makes an angle of 45 degrees with the plane of the loop
D. The loop is in the magnetic field
Answer: The magnetic field is perpendicular to the plane of the loop
In a moving coil galvanometer, the moving coil experiences a torque when:
A. A current passes through it
B. It is exposed to a constant magnetic field
C. It is rotating in a plane parallel to the magnetic field
D. It is stationary in a magnetic field
Answer: A current passes through it