Magnetic Effects Of Current Question 72
Question: A circular coil ?A? has a radius R and the current flowing through it is I. Another circular coil ?B? has a radius 2R and if 2I is the current flowing through it, then the magnetic fields at the centre of the circular coil are in the ratio of (i.e. $ B_{A} $ to $ B_{B} $ ) [CBSE PMT1993; AIEEE 2002]
Options:
A) 4 : 1
B) 2 : 1
C) 3 : 1
D) 1 : 1
Show Answer
Answer:
Correct Answer: D
Solution:
$ B\propto \frac{i}{r} $
BETA
