A heater coil is cut into two parts of equal length and one of them is used in the leader. The ratio of the heat procued by this half coil to that by the original coil is
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The resistance of half part of a coil, `R' = R//2` `:.` Heat produced. `H = V^(2)t/(R') = (V^(2)t)/(R//2)` , Original heat produced, `H = (V^(2)t)/(R) :. (H')/(H) = 2`
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