Question

Which of the following is correct for a straight wire carrying an electric current ?

• A. There are no magnetic lines of force near the wire
• B. There are lines of force and they are circular lines encircling the wire
• C. The lines of force are straight lines parallel to the wire and in the direction opposite to the current
• D. The lines of force are straight lines parallel to the wire in the same direction to the current

Answer 1

Answer: (B)

There are lines of force and they are circular lines encircling the wire

When a straight wire carries an electric current, magnetic lines of forces exist and they are circular lines encircling the wire, can be determined using right hand screw rule.