Assertion (A): A transformer is useful for stepping up or stepping down voltages

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1. Assertion (A): A transformer is useful for stepping up or stepping down voltages. Reason (R): A transformer is a device specifically used in DC circuits. Which is correct?

Both A and R are true, and R correctly explains A

Both A and R are true, but R does not correctly explain A

A is true, but R is false

A is false, but R is true

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Assertion A is genuinely correct. Reason R is false, though — transformers work specifically with alternating current, since they need a continuously changing magnetic flux to function at all.