Question -
Answer -
1. The field consists of straight lines perpendicular to the wire.
2. The field consists of straight lines parallel to the wire.
3. The field consists of radial lines originating from the wire.
4. The field consists of concentric circles centered on the wire.
Answer
d. The field consists of concentric circles centered on the wire.
The magnetic field near a long straight wire are concentric circles. Their centers lie on the wire.