Question

Assertion (A): A coil of many turns of an insulated copper wire is wound over soft iron core.

Reason (R): The strength of electromagnet increases with the increase in the magnitude of current.

विकल्प

• Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

• Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).

• Assertion (A) is false, but Reason (R) is true.

• Assertion (A) is true, but Reason (R) is false.

Answer 1

Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).

Explanation:

Winding a coil of many turns over a soft iron core is the way an electromagnet is made. It is also true that increasing the current increases the strength of an electromagnet. However, the reason only states a factor affecting the strength; it does not explain why the coil is wound over the soft iron core.