Free Electromagnetism MCQs with Answers

• A. remain stationary
• B. move towards the loop
• C. move away from the loop
• D. rotates about the axis

Explanation: In a situation where a loop is fixed and a straight wire can move, the motion of the wire can be determined by considering the interaction…

• A. a proton and an alpha particle respectively
• B. a deuteron and an electron respectively
• C. an electron and a proton respectively
• D. rotates about the axis

Explanation: When two charged particles are projected with the same velocity in a uniform magnetic field, the trajectory each particle follows is…

• A. strong
• B. weak
• C. radial
• D. radial and stronger

Explanation: The concave pole faces of a magnet and a soft iron cylinder in a galvanometer are configured to affect the magnetic field within the…

• A. Loop P (Square)
• B. Loop Q (Horizontal Rectangle)
• C. Loop R (Vertical Rectangle)
• D. Loop S (Circle)

Explanation: Understanding the shapes of the loops helps determine their relative torques in a magnetic field.

• A. AC generator
• B. DC dynamo
• C. Motor
• D. transformer

Explanation: Mutual induction is a phenomenon where a change in current in one coil induces an electromotive force (EMF) in an adjacent coil.

• A. the rate of change of the magnetic field
• B. the rate of change of the electric field
• C. the rate of change of the magnetic flux
• D. the rate of change of the electric flux

Explanation: Faraday's law of electromagnetic induction states that the electromotive force (EMF) induced in a coil is proportional to the rate of…

• A. AC current
• B. DC current
• C. induced current
• D. Mean square current

Explanation: When a loop of wire moves across a magnetic field or experiences a change in magnetic flux, it induces an electromotive force (EMF)…

• A. maximum magnetic flux
• B. rate of change of magnetic flux
• C. change in magnetic flux
• D. None of these

Explanation: Faraday's law of electromagnetic induction states that the induced electromotive force (EMF) in a circuit is directly proportional to the…

• A. there is a steady reading G as long as Sis closed
• B. a motion emf is generated when S is closed
• C. the cuurent in the battery goes through G
• D. there is a current in G just after S is opened or closed

Explanation: Faraday's law of electromagnetic induction states that the magnitude of induced electromotive force (EMF) in a circuit is directly…

• A. fluctuates off and on
• B. varies in magnitude alone
• C. changes its direction again and again
• D. changes its magnitude continuously and reverses its direction of flow after regularly recurring intervals

Explanation: Alternating current (AC) or voltage undergoes continuous variations in magnitude and regularly reverses its direction of flow.

• A. mechanical energy into electrical energy
• B. electrical energy
• C. magnetic energy into electrical energy
• D. all of these

Explanation: A dynamo is a device that converts mechanical energy into electrical energy through electromagnetic induction.

• A. galvanometer
• B. ammete
• C. voltmeter
• D. all of the above

Explanation: A galvanometer functions like a motor. A galvanometer is an instrument that detects and measures small electric currents.

• A. thickness of the wire in X
• B. resistance of X
• C. rate of change of magnetic field in X
• D. all of the above

Explanation: According to Faraday's law of electromagnetic induction, the electromotive force (EMF) induced in a coil is proportional to the rate of…

• A. galvanometer
• B. ammeter
• C. voltmeter
• D. all of the above

Explanation: A galvanometer is an instrument that measures electric current, and it works on the principle of the torque experienced by a…

• A. Current flowing
• B. Number of turns per unit length
• C. Voltage produced
• D. all

Explanation: The magnetic field produced by the current in the coil is a key factor influencing self-inductance.

• A. decrease
• B. become zero
• C. remain the same
• D. increase

Explanation: When a coil is wound on an iron core, the presence of the iron core enhances the magnetic permeability of the medium.

• A. LI^2
• B. 0.5L^2 * I
• C. 0.5L * I^2
• D. IL^2

Explanation: The energy stored in a magnetic field in an inductor is given by the formula W = LI2, where:* W is the energy stored,* L is the inductance…

• A. move coil P towards coil Q
• B. open S
• C. move coil Q toward coil P
• D. move the slide of the rheostat R quickly to the right

Explanation: We should open S as will reduce the flux associated with the coil Q which will induce emf in opposite direction resulting in a deflection…

• A. transformer
• B. motor
• C. DC generator
• D. AC generator

Explanation: A transformer is a device that transfers electrical energy between two or more circuits through electromagnetic induction.

• A. carbon brushes
• B. coil
• C. commutator
• D. magnetic field

Explanation: The primary difference between the construction of a DC generator (Direct Current) and an AC generator (Alternating Current) lies in the…