Question

The direction of magnetic field \( dB \) due to current element \( dl \) at a distance \( r \) is the direction of

• A. \( r \times dl \)
• B. \( dl \times r \)
• C. \( (r \hat{d}) \)
• D. \( dl \)

Hint:

The direction of the magnetic field due to a current element is given by the right-hand rule, where the field is perpendicular to both the current and position vector.

Answer 1

The Correct Option is A

The magnetic field produced by a current element is given by the Biot-Savart law, where the direction of the magnetic field is perpendicular to both the current element \( dl \) and the position vector \( r \), and follows the right-hand rule.