Question

A solenoid of length 20 cm and radius 2 cm is closely wound with 200 turns. The magnetic field intensity at either end of the solenoid when the current in the winding is 5 amp. is

• A. 2500 Amp/m
• B. 2000 Amp/m
• C. 1750 Amp/m
• D. 2940 Amp/m

Answer 1

Answer: (A)

2500 Amp/m

Answer 2

$H=\frac{B}{\mu_0}=\frac{ni}{2}$