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JEE Main202523 Jan 2025Morning ShiftPhysicsMagnetic Effects of CurrentActual

Consider a moving coil galvanomenter (MCG): A. The torsional constant in moving coil galvanometer has dimentions [ ML ^2 ~T ⁻² ] B. Increasing the current sensitivity may not necessarily increase the voltage sensitivity. C. If we increase number of turns ( N ) to its double (2 ~N ) , then the voltage sensitivity doubles. D. MCG can be converted into an ammeter by introducing a shunt resistance of large value in paral

Options

  1. AA, D Only
  2. BA, B, E Only
  3. CB, D, E Only
  4. DA, B Only

Correct answer

D. A, B Only

Step-by-step solution

(A) = C [ ML ^2 ~T ⁻² ]=[ C ][1] (B) C . S = I = BNA C ; V.S. = BNA RC [ R also depends on ' N '] (C) V.S. NAB CR R NR (D) False [Theory] (E) E [False] C . S ~N C . S .= NAB C

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