Magnetic Effects Of Current Question 123
Question: When the current flowing in a circular coil is doubled and the number of turns of the coil in it is halved, the magnetic field at its centre will become [DPMT 2003]
Options:
A) Four times
B) Same
C) Half
D) Double
Show Answer
Answer:
Correct Answer: B
Solution:
$ B=\frac{{\mu_{0}}}{4\pi }.\frac{2\pi ni}{r}\Rightarrow B\propto ni $
BETA
