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In the circuit shown in Figure. Battery, ammeter and volt meter are ideal and the switch $S$ is initially closed, When switch $S$ is opened, match the parameter in column in I with the effects column II and indicate your answer by darkening appropriate bubbles In the $4 \times 4$ matrix given in the OMR
Column-I Column-II
(A) Equivalent resistance across the battery (p) Remains same
(B) Power dissipated by left resistance R (q) Increase
(C) Voltmeter reading (r) Decrease
(D) Ammeter reading (s) Becomes zero

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$(A) \to r; (B) \to r; (C) \to q; (D) \to r$

$(A) \to r; (B) \to r; (C) \to r; (D) \to q$

$(A) \to q; (B) \to r; (C) \to r; (D) \to r$

$(A) \to r; (B) \to q; (C) \to r; (D) \to r$

answer is B.

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Detailed Solution

When the switch is closed, equivalent resistance is R, After opening the switch, the equivalent resistance becomes 2 R, hence, equivalent resistance increases
Also current through battery decreases, hence ammeter reading decrease. Current through left R also decreases

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