Question

Assertion: An important application of electromagnetic induction is ac generator
Reason: The direction of current changes periodically and therefore the current is called alternating current

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (B)

Electromagnetic induction states that when magnetic flux linked with a coil is changed, an emf is induced in the coil which is called induced emf.
AC generator uses the same principle of electromagnetic induction.
In an AC generator a coil is rotated in presence of a constant magnetic field, this changes the magnetic flux linked to it and an emf is induced which in turn produces a periodically changing current called alternating current.
And the AC is called alternating current because it changes direction
periodically.
Assertion and Reason both are correct but reason is not the correct explanation of assertion .