Moving coil galvanometers M ₁ and M ₂ have resistance, number of turns, area of coil and magnetic field as follows. R ₁=10 , R ₂=14 , N ₁=30, ~N ₂=42 A ₁=3 6 10⁻³ ~m ², ~A ₂=1 8 10⁻² ~m ², ~B ₁=0 25 ~T , ~B ₂=0 50 ~T (Spring constants are s

Question

Moving coil galvanometers M ₁ and M ₂ have resistance, number of turns, area of coil and magnetic field as follows. R ₁=10 , R ₂=14 , N ₁=30, ~N ₂=42 A ₁=3 6 10⁻³ ~m ², ~A ₂=1 8 10⁻² ~m ², ~B ₁=0 25 ~T , ~B ₂=0 50 ~T (Spring constants are same for both materials) The ratio of (i) current sensitivity and (ii) voltage sensitivity for galvanometer ( M ₂ . to . M ₁ ) is respectively

Quantrex Academy · Accepted Answer

Correct answer: D. 1 4: 11: 1

(D) We know, L = ₀ ~N ² A If x is the length of the wire and a is the area of cross section R = x a m = axD Rm = x a axD x = Rm D Also, x=2 r N N = x 2 r = ₀ ( x 2 r )² r ² = ₀ 4 Rm D

Options

Correct answer

Step-by-step solution

More from Current Electricity