Magnetic Effects Of Current Question 6
Question 6 - 25 January - Shift 1
A solenoid of 1200 turns is wound uniformly in a single layer on a glass tube $2 m$ long and $0.2 m$ in diameter. The magnetic intensity at the center of the solenoid when a current of 2 A flows through it is:
(1) $2.4 \times 10^{3} A m^{-1}$
(2) $1.2 \times 10^{3} A m^{-1}$
(3) $1 A m^{-1}$
(4) $2.4 \times 10^{-3} A m^{-1}$
Show Answer
Answer: (2)
Solution:
Formula: Magnetic field due to solenoid
Magnetic field at centre inside the solenoid is given by
$B=\mu_0 nI$
So magnetic intensity at centre
$H=\frac{B}{\mu_0}=nI=(\frac{1200}{2})(2)$
$H=1.2 \times 10^{3} Am^{-1}$
