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Assertion: Only a charge in magnetic flux will maintain an induced current in the coil.
Reason: The presence of large magnetic flux through a coil maintains a current in the coil if the circuit is continuous.

A

If both the assertion and reason are true and reason is a true explantion of the assertion.

B

If both the assertion and reason are true but the reason is not true the correct explantion of the assertion.

C

If the assertion is true but reason false

D

If both the assertion and reason are false.

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The correct Answer is:C

Presence of magnetic flux cannot produce current.

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Updated on:21/07/2023
Class 12PHYSICSALTERNATING CURRENT

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  • Question 1 - Select One

    This section contains Assertion and Reason type questions. 'Each question has 4 choices (1), (2),(3) and (4), out of which only one is correct.
    Assertion (A) Only a charge in magnetic flux will maintain an induced current the coil.
    Reason (R) The presence of large magnetic flux through a coil maintain a current in the coil if the circuit is continuous.

    ABoth Assertion and Reason are correct and Reason Is the correct explanation of the Assertion
    BBoth Assertion and Reason are correct but Reason Is not the correct explanation of Assertion
    CAssertion Is correct but Reason Is Incorrect
    DAssertion Is Incorrect and Reason Is correct
  • Question 1 - Select One

    Assertion (A): Induced current in a coil is maintained only by a change in magnetic field.
    Reason (R): The presence of large magnetic flux through a coil maintains a current in the coil if the circuit is continuous.

    ABoth (A) and (R) are true and (R) is the correct explanation of (A).
    BBoth (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.
  • Question 1 - Select One

    Magnetic flux through a coil depends upon

    Anumber of turns
    Barea
    Cmagnetic field
    Dall of these
  • Question 1 - Select One

    Assertion: Magnetic field B (shown inwards) varies with time t as shown. At time to induced current in the loop is clockwise
    ocr_image
    Reason : If rate of change of magnetic flux from a coil is constant, charge should flow in the coil at a constant rate.

    AIf both Assertion and Reason are true and the Reason is correct explanation of the Assertion.
    BIf both Assertion and Reason are true but Reason is not the correct explanation of Assertion
    CIf Assertion is true, but the Reason is false.
    DIf Assertion is false but the Reason is true.
  • Question 1 - Select One

    Whenever the magnet flux linked with a coil changes, then is an induced emf in the circuit. This emf lasts

    AFor a short time
    BFor a long time
    CFor ever
    DSo long as the change in the flux takes place
  • Question 1 - Select One

    The formula for induced e.m.f. in a coil due to change in magnetic flux through the coil is (here A = area of the coil, B = magnetic field)

    Ae=−A.dBdt
    Be=−B.dAdt
    Ce=−ddt(A.B)
    De=−ddt(A×B)
  • Question 1 - Select One

    The magnetic flux linked with a coil is ϕ and the emf induced in it is e.

    AIf ϕ=0,e must be 0
    BIf ϕ≠0,e cannot be 0
    CIf e is not 0,ϕ may or may not be 0
    DNone of the above is correct

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