Question

A Tangent Galvanometer has $500$ turns, each of radius $2\pi$ cm. If $B_H=3.6\times {10}^{-5}wb/m^2$, the deflection due to $7.2mA$ current is:

• A. ${60}^0$
• B. ${30}^0$
• C. ${45}^0$
• D. Zero

Answer 1

The correct option is C ${45}^0$

for tangent galvanometer
$B_{H}tan\theta =\frac{n{\mu }_{0}i}{2r}$
$3.6\times {10}^{-5}\times tan\theta =\frac{500\times 4\pi \times {10}^{-7}\times 7.2\times {10}^{-3}}{2\times 2\pi \times {10}^{-2}}$
$tan\theta =1$
$\theta ={45}^0$