Question

The magnetic field at any point on the axis of a current element is ______

Options

• zero

• maximum

• minimum

• a constant

Answer 1

The magnetic field at any point on the axis of a current element is zero.

Explanation:

dB = `mu_0/(4pi) (Id"/"sintheta)/r^2`

At any point on the axis θ = 0° ⇒ sin θ = 0