MCQ
When a certain length of wire is turned into one circular loop, the magnetic induction at the centre of coil due to current 'I' flowing through it is $B _1$. If the same wire is turned into four loops to make a circular coil, the magnetic induction at the centre of this coil is ' $B _2$ ' for same current then relation between $B _2$ and $B _1$ is ____________.
- A$B _2=64 B_1$
- B$B_2=4 B_1$
- ✓$B_2=16 B_1$
- D$B_2=8 B_1$