A solenoid of 1000 turns is wound uniformly on a glass tube 4 m long and 0.3 m in diameter. The magnetic intensity at the centre of the solenoid when a current of 4 A flows through it is

Step-by-step solution

Given N = 1000 , L = 4 m , I = 4 A . The number of turns per unit length is n = N L = 1000 4 = 250 m ⁻¹ . The magnetic intensity H at the centre of a long solenoid is given by H = nI . Substituting the given values: H = 250 4 = 1000 A/m = 10³ A/m . Answer: 10⁺³ A/m