Question

A long solenoid has 200 turns per cm and carries a current of 2.5 A. The magnetic field at the center is ______. (µ₀ = 4π × 10^-7 Wb/m-A)

Options

• 5.41 × 10^-3 Wb/m²

• 6.28 × 10^-2 Wb/m²

• 2.2 × 10^-4 Wb/m²

• None of these

Answer 1

A long solenoid has 200 turns per cm and carries a current of 2.5 A. The magnetic field at the center is 6.28 × 10^-2 Wb/m². 

Explanation:

B = `mu_0 "nI" = 4pi xx 10^-7 xx 200/10^-2 xx 2.5`

B = `6.28 xx 10^-2`Wb/m²