Question
Download Solution PDFA constant voltage source is applied between the two ends of a wire. If the length of the wire is doubled and the radius remains the same, then the rate of heat developed in the wire ________.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept
The heat developed in the wire is given by:
The resistance is given by:
where, H = Developed heat
I = Current
R = Resistance
L = Length of wire
Calculation
Given, L2 = 2L1 and A2 = A1
If resistance becomes twice, then the current will become half of the initial value.
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