Question

A rope of length 65/4m has to be tied around a circular tree many times (as shown in the figure). If the length of one circular loop around the tree measures 5/8m, then how many such loops can be made around the tree? (A) 7 (B) 13 (C) 18 (D) 26

Answer 1

Answer:

This is the answer

Step-by-step explanation:

The circumference of the first loop is the length of the wire=2πR

The magnetic field at the center of this wire=B=

2R

μ

0

I

The same wire is bent into n circular coils.

Thus new radius is found out by

n×2πr=2πR

⟹r=

n

R

Thus magnetic field at the center of these loops=n

2r

μ

0

I

=

2R

n

2

μ

0

I

=n

2

B

Answer 2

Answer:

(7)or a part will be the answer