KCET · Physics · Motion In Two Dimensions

In the A.C. circuit shown, keeping ' \( K \) ' pressed, if an iron rod is inserted into the coil, the bulb in
the circuit,

A glows more brightly
B glows less brightly
C glows with same brightness (as before therod is inserted)
D gets damaged

Verified Solution

Answer & Solution

Correct Answer

(B) glows less brightly

Step-by-step Solution

Detailed explanation

If an iron rod is inserted into the coil, the inductive reactance in the circuit will increase thereby increasing the
effectiveinductance of the circuit. Therefore, the potential differenceand thus, the current in the circuit will decrease and
hence bulb glows less brightly

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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In the A.C. circuit shown, keeping ' \( K \) ' pressed, if an iron rod is inserted into the coil, the bulb inthe circuit,

Step-by-step Solution

In the A.C. circuit shown, keeping ' \( K \) ' pressed, if an iron rod is inserted into the coil, the bulb in
the circuit,