Question

Assertion:
An alternating current does not show any magnetic effect.

Reason:
Alternating current does not vary with time.

A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
B. Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
C. Assertion is correct but Reason is incorrect.
D. Both Reason and Assertion are incorrect.

Answer 1

Alternating current is an electric current which varies which periodically reverses its direction and also magnitude of current changes with time.

Complete step by step answer:

This is the alternating current in which magnitude and direction of current is changing with time.
Now we know that Magnetic field is produced only by moving charge/current so it does not matter whether current is alternating or direct. Only difference in alternating current from direct current is that in alternating current the magnitude of current is continuously changing and it's direction changes over a period of time
So our Assertion is false.
When we see reason it is easily clear that Alternating current varies with time. Its equation can be written in function of and functions.
So our Reason is also false.
Hence the correct option is D.
Note: Students can easily identify that reason is given incorrectly. So our two options can easily be eliminated. One confusion arises between students is that they thought that alternating current reverse direction so the net magnetic field is canceled but it’s wrong. Magnetic field is also produced by Alternating current.