A solenoid has a core of a material with a relative permeability of 500. The windings of the solenoid are insulated from the core and carry a current of 0.5 A. If the number of turns is 2000 per metre, the magnetic intensity is
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → $10^3\, A m^{-1}$
Given:
Relative permeability: $\mu_r = 500$
Current: $I = 0.5$ A
Number of turns per unit length: $n = 2000 \ \text{turns/m}$
Magnetic field intensity inside solenoid (independent of core material):
$H = nI$
$H = 2000 \times 0.5 = 1000 \ \text{A/m}$
Answer: $H = 1000 \ \text{A/m}$