STANDARDPhysics-Electromagnetic Induction
STANDARD Physics Moving Coil Galvanometer MCQ Question
Type: MCQ-numerical-Medium-Class 12
Two moving coil metres M₁ and M₂ have the following particulars R₁ = 10Ω; N₁ = 30; A₁ = 3.6 × 10⁻³ m²; B₁ = 0.25T; R₂ = 14Ω; N₂ = 42; A₂ = 1.8 × 10⁻³ m²; B₂ = 0.50T. The spring constants are identical for the two metres. What is the ratio of current sensitivity and voltage sensitivity of M₂ to M₁?
A
1.4, 0
B
2.8, 2
C
2.8, 0
D
1.4, 1
Correct Answer
Option A
Detailed Explanation
The current sensitivity is given by the formula I = NBA/k. For M₂ and M₁, the ratio of current sensitivities is calculated as 1.4. The voltage sensitivity is given by V = NBA/kR. For M₂ and M₁, the ratio of voltage sensitivities is calculated as 1. Therefore, the ratio of current sensitivity and voltage sensitivity of M₂ to M₁ is 1.4, 0.
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