JEE Mains · Physics · STD 12 - 4. Moving charges and magnetism
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 :
- 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
Answer & Solution
Correct Answer
(D) Statement \(I\) is true but Statement \(II\) is false
Step-by-step Solution
Detailed explanation
For a moving coil galvanometer \(\text { BiNA }= k \theta\) \(\theta=\left(\frac{ BNA }{ k }\right) i ; \text { Current sensitive }=\frac{ BNA }{ k }\) So, if \(N\) is doubled then current sensitivity is doubled. Voltage sensitivity \(B \frac{ V }{ R } NA = k \theta\)…
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