Question

The coil of galvanometer consists of 100 turns and effective area of 1 square cm. The restoring couple is 10^-8 N-m/rad. The magnetic field between the pole pieces is 5T. The current sensitivity of this galvanometer will be ______.

Options

• 5 × 10⁴ rad/μA

• 5 × 10^-6 rad/μA

• 2 × 10^-7 rad/A

• 5 rad/μA

Answer 1

The coil of galvanometer consists of 100 turns and effective area of 1 square cm. The restoring couple is 10^-8 N-m/rad. The magnetic field between the pole pieces is 5T. The current sensitivity of this galvanometer will be 5 rad/μA.

Explanation:

Current sensitivity `theta/"I" = "NBA"/"C"`

`= (100 xx 5 xx 10^-4)/10^-8`

= 5 rad/μ amp