Question

A long solenoid has $800$ turns per metre length of solenoid. A current of $1.6\text{A}$ flows through it.

$\left(ii\right)$ Find the value of magnetic field at the centre of the solenoid.

​​​​​​​$[$1 Mark$]$

• A. $16\times {10}^{-4}\text{T}$
• B. $8\times {10}^{-4}\text{T}$
• C. $32\times {10}^{-4}\text{T}$
• D. $4\times {10}^{-4}\text{T}$

Answer 1

The correct option is A $16\times {10}^{-4}\text{T}$

Magnetic field inside the solenoid is given by, $B={\mu }_{0}ni$

$B=4\pi \times {10}^{-7}\times 800\times 1.6$
$B_i=16\times {10}^{-4}\text{T}$