NEET2013Physics-Electricity
NEET 2013 Physics Heating Effect of Current MCQ Question
Type: MCQ-numerical-Medium-Class 12
Ten identical cells connected in series are needed to heat a wire of length one metre and radius 'r' by 10°C in time 't'. How many cells will be required to heat the wire of length two metre of the same radius by the same temperature in time 't'?
A
20
B
30
C
40
D
10
Correct Answer
Option A
Detailed Explanation
The resistance of the wire is proportional to its length. Doubling the length doubles the resistance, requiring double the voltage, hence double the number of cells.
Found an issue with this question?