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Solve and explain please If a constant current of 1 A passes through the current divider parallel resistors shown in the figure to the right,

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Solve and explain please

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If a constant current of 1 A passes through the current divider parallel resistors shown in the figure to the right, the 4R di current i is given by i = OR + 20 where R is a variable resistor. Find dR di dR

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