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Question
In the circuit shown, the voltmeter reading is 40 V. Find the value of unknown resistor R
In the circuit shown, the voltmeter reading is 40 V. Find the value of unknown resistor R
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Solution
The correct option is A
Since the voltage across the resistor is 40V, we have
20i = 40 ⇒ i = 2A ⇒
Applying KVL to the loop
−40−10R−20+100=0 ⇒R=4Ω
Since the voltage across the resistor is 40V, we have
20i = 40 ⇒ i = 2A ⇒
Applying KVL to the loop
−40−10R−20+100=0 ⇒R=4Ω
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