Physics
Grade-10
Easy
Question
Assertion (A): When the current in a coil changes, it induces a back emf in the same coil.
Reason (R): Emf is a measure of the inertia of the coil against the change of current through it.
- Both A and R are true, and R is the correct explanation of A
- Both A and R are true, and R is not the correct explanation of A
- A is true, but R is false
- A is false, but R is true
Hint:
The electromagnetic field is created back when the current flow changes and it acts as a measure of inertia in the coil against the current change.
The correct answer is: Both A and R are true, and R is the correct explanation of A
Both A and R are true, and R is the correct explanation of A
- The electromagnetic field is created back when the current in a coil varies.
- The electromagnetic field is created in the field of the coil against the change in current flow.
- The reverse emf generated in the coil serves as a measure for the coil's resistance to changes in the flow of current through it.
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