1. | \(N\) is small | 2. | \(B\) is small |
3. | \(A\) is small | 4. | \(C\) is small |
Which among the following options needs to be decreased to increase the sensitivity of a moving coil galvanometer?
1. | the number of turns in the coil. | 2. | the area of the coil. |
3. | the magnetic field. | 4. | the couple per unit twist of the suspension. |
1. | \(40~ \Omega\) | 2. | \(25~ \Omega\) |
3. | \(250~ \Omega\) | 4. | \(500~ \Omega\) |
What happens when the number of turns in a galvanometer is doubled?
1. | voltage sensitivity becomes double. |
2. | current sensitivity becomes double. |
3. | voltage sensitivity becomes half. |
4. | current sensitivity remains the same. |
A. | decreasing the number of turns. |
B. | increasing the magnetic field. |
C. | decreasing the area of the coil. |
D. | decreasing the torsional constant of the spring. |
1. | (B) and (C) only |
2. | (C) and (D) only |
3. | (A) and (C) only |
4. | (B) and (D) only |