a
circuit with power supply
of emf 10V
and internal resistance
3 ohms. The current through corcuit
is 2 A. What is value of R
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Explanation:
I = E / ( R + r)
= 10 / ( R + 3)
2 = 10 / ( R + r)
2R + 2x 3 = 10
2R = 10 - 6 = 4
R = 2 ohm
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