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Standard XII

Physics

Power

A constant vo...

Question

A constant voltage of $25 V$ is applied to a series L-R circuit at $t = 0$ , by closing a switch. What is the potential difference across the resistor and the inductor at time $t = 0$ ?

0 V, 25 V

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12.5 V, 12.5 V

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10 V, 15 V

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25 V, 0 V

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Solution

The correct option is A $0 V, 25 V$
Current across inductor does not change suddenly. Before closing the switch, current was zero. Hence, just after opening the switch current remains zero.
By ohm's law, voltage across resistor, $V_{R} = I R = 0 V$
By KVL, $V_{a p p l i e d} = V_{R} + V_{L}$
$25 = 0 + V_{L}$
$V_{L} = 25 V$

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A constant voltage of 25 V is applied to a series L-R circuit at t=0, by closing a switch. What is the potential difference across the resistor and the inductor at time t=0?

The correct option is A 0 V,25 VCurrent across inductor does not change suddenly. Before closing the switch, current was zero. Hence, just after opening the switch current remains zero. By ohm's law, voltage across resistor, VR=IR=0VBy KVL, Vapplied=VR+VL25=0+VLVL=25V

A constant voltage of $25 V$ is applied to a series L-R circuit at $t = 0$ , by closing a switch. What is the potential difference across the resistor and the inductor at time $t = 0$ ?