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Combination of Resistors

In the circui...

Question

In the circuit shown in figure, R = 10 $Ω$ , L = 5H, E = 20 V, i = 2A. This current is decreasing at the rate of 1.0 $\frac{A}{s e c} .$

A

V_{a b}

=25 V

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B

V_{a b}

=35 V

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C

L

\frac{d i}{d t}

= 5V

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D

L

\frac{d i}{d t}

= -5V

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Solution

The correct options are
B $V_{a b}$ =35 V
D L $\frac{d i}{d t}$ = -5V
L $\frac{d i}{d t} = 5 \times (- 1)$ =-5 Volt

$V_{a b} = E + i R + V_{L} = 20 + (2 \times 10) - 5$ = 35 Volt

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