Magnetic Effects Of Current Question 91
Question: A closely wound flat circular coil of 25 turns of wire has diameter of 10 cm and carries a current of 4 ampere. Determine the flux density at the centre of a coil [AIIMS 2001]
Options:
A) $ 1.679\times {{10}^{-5}}tesla $
B) $ 2.028\times {{10}^{-4}}tesla $
C) $ 1.257\times {{10}^{-3}}tesla $
D) $ 1.512\times {{10}^{-6}}tesla $
Show Answer
Answer:
Correct Answer: C
Solution:
$ B={{10}^{-7}}\frac{2\pi ni}{r}={{10}^{-7}}\times \frac{2\times \pi \times 25\times 4}{5\times {{10}^{-2}}}=1.257\times {{10}^{-3}},T $
BETA
