In the given circuit the internal resistance of the 18v cell is negligible. If R 1 = 400 Ω Ω , R 3 = 100 Ω Ω and R 4 = 500 Ω Ω and the reading of an ideal voltmeter across R 4 is 5V, then the value of R 2 will be:
Text Solution
Verified by ExpertsThe correct answer is:
D
V 500 = 5V = I 1 R 4
V 100 = 1V
V = 1 + 5 = 6V
V 400 = 18 – 6 = 12V
R 2 = 
= 300 Ω Ω
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