Question

A wire placed along north south direction carries a current of 5A from south to north. Find the magnetic field due to a 1m piece of wire at a point 200 cm north east from the piece.

Options

• 8.8 × 10^-10 T acting vertically downward

• 4.4 × 10^-10 T acting vertically downward

• 2.2 × 10^-10 T acting vertically upward

• 1.1 × 10^-10 T acting horizontally

Answer 1

8.8 × 10^-10 T acting vertically downward

Explanation:

dB = `mu_0/(4pi) xx ("Id"  ℓ sin theta)/"r"^2`

= `(10 ^-7 xx 5 xx 10^-2 xx sin 45)/(2)^2`

dB = 8.8 × 10^-10 T

Acting vertically downward.