Q. A tangent galvanometer is connected directly to an ideal battery. If the number of turns in the coil is doubled, the deflection will
A) Increase
B) Decrease
C) Remain unchanged
D) Either increase or decrease
Explanation
(c) Using tangent law
$\frac{\mu_{0}}{4\pi}.\frac{2\pi nI}{r} = H\tan\theta$
$nI \propto \tan\theta$
On increasing no. of turns, resistance and length increases so current decreases and $nI$ remains same
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.