Question

A solenoid of length `50cm`, having `100` turns carries a current of `2*5A`. Find the magnetic field, (a) in the interior of the solenoid, (b) at one end of the solenoid.
Given `mu_0=4pixx10^-7WbA^-1m^-1`.
A. `3.14 xx 10^(-4)T`
B. `6.28 xx 10^(-4)T`
C. `1.57 xx 10^(-4)T`
D. `9.42 xx 10^(-4)T`

Answer 1

Correct Answer - A
Here, I = 2.5 A, l = 50 cm = 0.50 m
and `n=(100)/(0.50)=200m^(-1)`
`therefore" "B=(mu_(0)nI)/(2)=(4pi xx 10^(-7)xx200xx2.5)/(2)=3.14xx10^(-4)T`