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A wire of length  and 3 identical cells of negligible internal resistances are connected in series. Due to the current, the temperature of the wire due to the current, the temperature of the wire is raised by  is a time . A number of similar cells is now connected in series with a wire of the same material and cross-section but of length . The temperature of the wire is raised by the same amount  in the same time . The value of  is



Question ID - 151129 | SaraNextGen Top Answer

A wire of length  and 3 identical cells of negligible internal resistances are connected in series. Due to the current, the temperature of the wire due to the current, the temperature of the wire is raised by  is a time . A number of similar cells is now connected in series with a wire of the same material and cross-section but of length . The temperature of the wire is raised by the same amount  in the same time . The value of  is

1 Answer
127 votes
Answer Key / Explanation : (b) -

(b)

Now,          …(i)

and      …(ii)

Solving (i) and (ii), we get .

127 votes


127