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A metal rod of length 10 cm and a rectangular cross-section of 1 cm xx (1)/(2) cm is connected to a battery across oppostie faces. The resistance will be |
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Answer» maximum when the battery is connected across 1 cm `xx (1)/(2)` cm faces.  resistance of rod, R = `(rho l )/(A)` `therefore R prop (l)/(A)` Hence, to obtain large value of resistance its length (l) should be more and cross section area (A) should be less. This is POSSIBLE when batteryis connected both 1 cm `xx (1)/(2)` cm side. |
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