The magnetic field lines around a straight current-carrying conductor are
- AParallel lines
- BMany points
- CConcentric circles
- DMore than one of the above
- ENone of the above
Show answer and explanation
Correct answer: (c) Concentric circles
Explanation
Around a straight wire carrying current, the magnetic field lines are concentric circles centred on the wire.
Their direction is given by the right-hand thumb rule: with the thumb along the current, the curled fingers show the field.