NEET2020Physics-Current Electricity
NEET 2020 Physics Metre Bridge MCQ Question
Type: MCQ-numerical-Medium-Class 12
A resistance wire connected in the left gap of a metre bridge balances a 10 Ω resistance in the right gap at a point which divides the bridge wire in the ratio 3 : 2. If the length of the resistance wire is 1.5 m, then the length of 1 Ω of the resistance wire is:
A
1.5 × 10⁻¹ m
B
1.5 × 10⁻² m
C
1.0 × 10⁻² m
D
1.0 × 10⁻¹ m
Correct Answer
Option D
Detailed Explanation
In a metre bridge, R/10 = 3/2 (ratio of bridge wire lengths), so R = 15 Ω. The resistance wire has total resistance 15 Ω and length 1.5 m. Length per 1 Ω = 1.5/15 = 0.1 m = 1.0 × 10⁻¹ m. The correct answer is D.
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