Exam

NEET

Year

2002

Subject

Physics

Chapter

Magnetic Effects of Current

NEET 2002 · Physics · Magnetic Effects of Current

The magnetic field of a given length of wire for a single turn coil...

The magnetic field of a given length of wire for a single turn coil at the centre is ' $B$ ' then, its value for two turns coil for the same wire is:

Step-by-step solution

Here $B_1=B=\frac{\mu_0 I}{2 R}$$\begin{aligned} & B_2=\frac{\mu_0(2 \mathrm{I})}{2 r} \\ & \therefore 2 \times 2 \pi r=2 \pi R \Rightarrow r=R / 2 \end{aligned}$$$So,$B_2 = 4 B$