Consider the following circuit:What is power delivered to

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Consider the following circuit:

What is power delivered to resistor R in the above circuit?

1. –15 W
2. 0 W
3. 15 W
4. Cannot be determined unless the value of R is known

Correct Option: B

The given circuit

The given circuit can be redrawn as shown below.

From above figure
P/Q = R/S
i.e.
60/120 = 30/60 (Wheatstone bridge)
Therefore, power delivered to resistor R is zero watt.