The two electrical subnetworks N1 and N2 are connected through

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The two electrical subnetworks N₁ and N₂ are connected through three resistors as shown below. The voltage across the 5Ω resistor and the 1Ω resistor are given to be 10V and 5V respectively. The voltage across the 15Ω resistor is—

1. – 105V
2. + 105V
3. – 15V
4. + 15V

Correct Option: A

The given circuit

Current in 5Ω resistor

l₁ =	10	= 2A(From N₁ to N₂)
	5

Current in 1Ω resistor
I₂ = 5/1 = 5A (From N₁ to N₂)
The current in 15Ω resistor must be = 2 + 5 = 7A (from N₂ to N₁)
The voltage across 15Ω resistor = – 15 × 7V = – 105V.