Question

If a current of 1 A flows through a solenoid of length 25 cm and made up of 250 turns of copper wire then the magnitude of magnetic induction inside the solenoid will be ______.

Options

• 0.12568 × 10⁻³ T

• 1.2568 × 10⁻³ T

• l.2568 × 10² T

• 1.256 × 10⁴ T

Answer 1

If a current of 1 A flows through a solenoid of length 25 cm and made up of 250 turns of copper wire then the magnitude of magnetic induction inside the solenoid will be 1.2568 × 10⁻³ T.

Explanation:

B = µ₀ n I

= `µ_0 N/l I`

= `4pi xx 10^-7 xx 250/(25 xx 10^-2) xx 1`

= 4 × 3.142 × 10⁻⁴

= 1.2568 × 10⁻³ T