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Question

An ideal battery sends a current of 5A in a resistor. When another resistor of value 10Ω is connected in parallel, the current through the battery is increased to 6A. find the resistance of the first resistor.

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Solution

R1=R, i1=5A

R2=10R10+R,i2=6A

Since potential constant,
i1R1=i2R2

5×R=6×10R10+R

(10+R)5=60

5R=10R=2Ω

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