Given below are two statement:
Statement I: If the number of turns in the coil of a moving coil galvanometer is doubled then the current sensitivity becomes double.
Statement II: Increasing current sensitivity of a moving coil galvanometer by only increasing the number of turns in the coil will also increase its voltage sensitivity in the same ratio:
In the light of the above statement, choose the correct answer from the options given below:
Statement I: If the number of turns in the coil of a moving coil galvanometer is doubled then the current sensitivity becomes double.
Statement II: Increasing current sensitivity of a moving coil galvanometer by only increasing the number of turns in the coil will also increase its voltage sensitivity in the same ratio:
In the light of the above statement, choose the correct answer from the options given below:
- (A)Statement I is false but Statement II is true
- (B)Both Statement I and Statement II are true
- (C)Both Statement I and Statement II are false
- (D)Statement I is true but Statement II is false✓ Correct
Answer: (D)
Solution
The deflection of a moving-coil galvanometer is , so the current sensitivity doubles when the number of turns is doubled; Statement I is true. The voltage sensitivity is , but doubling uses twice the length of wire and so doubles the coil resistance , leaving unchanged; the voltage sensitivity does not rise, so Statement II is false.
JEE Main · 2023 · 10 Apr 2023 · Shift 1 · Single correct option