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Find the potential difference required to pass a current of 0.2 A in a wire of resistant 20Ω.

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Find the potential difference required to pass a current of 0.2 A in a wire of resistant 20Ω.

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V = IR 

Current I = 0.2A 

Resistance R = 20Ω

Potential difference V = ? 

V = 0.2 × 20 = 4V 

The potential difference in a wire = 4V

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