Download the chapter on Electromagnetic Induction from the CBSE Class 12 Physics Assertion Reason Questions. Class 12 Physics Assertion Reason Questions with Answers were created using the most recent exam format. To gauge their degree of preparedness, students can complete the NCERT Class 12 Physics Chapter 6 Electromagnetic Induction.
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Electromagnetic Induction Class 12 Assertion Reason Questions
The following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false and R is also false.
Assertion (A): When a magnetic field through a closed loop changes, an electromotive force (EMF) is induced in the loop.
Reason (R): According to Faraday’s law of electromagnetic induction, a changing magnetic flux through a closed loop induces an EMF in the loop.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The direction of the induced EMF in a coil is independent of the rate of change of magnetic flux.
Reason (R): The direction of the induced EMF is given by Lenz’s law, which states that it opposes the change in magnetic flux.
Answer: (c) A is true but R is false.
Assertion (A): Electromagnetic induction is the phenomenon of generating an electric current using a magnetic field.
Reason (R): Electromagnetic induction occurs when there is relative motion between a conductor and a magnetic field, resulting in the generation of an EMF and an induced current.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The magnitude of the induced EMF in a coil is directly proportional to the rate of change of magnetic flux.
Reason (R): According to Faraday’s law, the induced EMF is equal to the negative rate of change of magnetic flux through the coil.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Transformers work on the principle of electromagnetic induction.
Reason (R): Transformers use two coils wound on a soft iron core, and the varying magnetic field in one coil induces an EMF in the other coil.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Eddy currents are induced electric currents that circulate in closed loops in a conductor.
Reason (R): Eddy currents are generated due to the changing magnetic flux through the conductor, and they produce heat in the conductor.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): A changing magnetic field can induce a current in an open loop of wire.
Reason (R): In an open loop, the induced EMF can drive a current only if the loop is completed by an external circuit.
Answer: (b) Both A and R are true but R is not the correct explanation of A.
Assertion (A): The back EMF is responsible for the self-inductance effect in a coil.
Reason (R): When the current in a coil changes, the magnetic field produced by the changing current induces an EMF that opposes the change in current.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Lenz’s law is a consequence of the law of conservation of energy.
Reason (R): Lenz’s law states that the direction of the induced EMF opposes the change in magnetic flux, and this ensures that energy is not created or destroyed during electromagnetic induction.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): A coil with a larger number of turns will have a higher self-inductance.
Reason (R): The self-inductance of a coil is directly proportional to the square of the number of turns.
Answer: (a) Both A and R are true and R is the correct explanation of A.
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