JEE Main 2025 Physics question
Consider a moving coil galvanometer (MCG) : A : The torsional constant in moving coil galvanometer has dimensions [ML²T⁻²] B : Increasing the current sensitivity may not necessarily increase the voltage sensitivity. C : If we increase number of turns (N) to its double (2N), then the voltage sensitivity doubles. D : MCG can be converted into an ammeter by introducing a shunt resistance of large value in parallel with galvanometer. E : Current sensitivity of MCG depends inversely on number of turns of coil. Choose the correct answer from the options given below :
Answer: (1)
Solution
τ=Cθ gives [C]=[ML²T⁻²] (A true). C.S. and V.S. depend differently on R which also depends on N (B true). C, D, E are false.