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AIPMT PRELIMS2008Physics-Electricity

AIPMT PRELIMS 2008 Physics Potentiometer MCQ Question

Type: MCQ-numerical-Medium-Class 12

A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively with and without being short circuited through a resistance of 10 Ω. Its internal resistance is -

A

2.0 Ω

B

zero

C

1.0 Ω

D

0.5 Ω

Correct Answer

Option C

Detailed Explanation

The internal resistance can be calculated using the formula r=R(l¹−l2l2)r = R \left( \frac{l_¹⁻ l_2}{l_2} \right), where l1l_1 and l2l_2 are the balancing lengths.

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