CBSE 2024, Set 1

Question

Assertion (A): Two long parallel wires, freely suspended and connected in series to a battery, move apart.
Reason (R): Two wires carrying current in opposite directions repel each other.

Select the correct option: A). Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). B). Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). C). Assertion (A) is true, but Reason (R) is false. D). Assertion (A) is false and Reason (R) is also false.

Edvaya · Accepted Answer

The correct answer is Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).. **SOLUTION** **Assertion (A) is True:** If two long parallel suspended wires are connected in series to a battery, the electric current travels down one wire and comes back up the other. This means they are carrying currents in **opposite directions**, which causes them to experience a repulsive magnetic force and move apart. **Reason (R) is True:** According to Biot-Savart Law and the Lorentz force equation, parallel wires carrying currents in opposite directions repel each other. Thus, Reason (R) correctly explains Assertion (A).

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Physics > Magnetism Induction And Alternating Current > Moving Charges And Magnetism

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