Magnetism Question 264
Question: The magnetic needle of a tangent galvanometer is deflected at an angle $ 30{}^\circ $ due to a magnet. The horizontal component of earth’s magnetic field $ 0.34\times {{10}^{-4}}T $ is along the plane of the coil. The magnetic intensity is
Options:
A) $ 1.96\times {{10}^{-4}}T $
B) $ 1.96\times {{10}^{-5}}T $
C) $ 1.96\times 10^{4}T $
D) $ 1.96\times 10^{5}T $
Show Answer
Answer:
Correct Answer: B
Solution:
[b] We know that $ \frac{B}{{B _{^{H}}}}=\tan \theta $ or $ B=B _{H}=\tan \theta $
$ =0.34\times {{10}^{-4}}\tan 30{}^\circ =1.96\times {{10}^{-5}}T $
BETA
