Two identical square rods of metal are welded end to end as shown in figure (a). 20 calories of heat flows through it in 4 minutes. if the rods are welded as shown in figure (b), the same amount of heat will flow through the rods in
A
1 minute
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B
2 minutes
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C
4 minutes
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D
16 minutes
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Solution
The correct option is A1 minute The rate at which the heat is developed is given by