In the figure, the value of resistor R is (25 + I/2) ohms,

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In the figure, the value of resistor R is (25 + I/2) ohms, where I is the current in amperes. The current I is _________

1. 15
2. 5
3. 10
4. None of these

Correct Option: C

R =		25 +	I
			2

Now V = RI

∴ 300 = I		25 +	I			∴ R = 25 +	I
			2				2

∴ 600 = 50 I + I²
I = 10 A or – 60 A
I² + 50 I – 600 = 0
∴ I = 10A