Physics · Force on a current-carrying conductor in a uniform magnetic field
A rectangular loop carrying a current is situated near a long straight wire such
A rectangular loop carrying a current \( i \) is situated near a long straight wire such that the wire is parallel to one of the sides of the loop and is in the plane of the loop. If steady current lis established in the wire as shown in fig. the loop will
- A. rotate about an axis parallel to the wire
- B. move away from the wire
- C. move toward the wire
- D. remain stationary
Step-by-step solution
The magnetic field due to the long straight wire is perpendicular to the plane of the loop. The forces on the sides parallel to the wire are attractive on the near side if currents are in the same direction and repulsive on the far side. Since the near side is closer, the net force is toward the wire. Forces on the perpendicular sides cancel vertically and do not produce a net torque about an axis parallel to the wire, so the loop moves toward the wire without rotating.
Related MCQs
- A current carrying ring is placed in a magnetic field. The direction of the field is perpendicular to the plane of the ring. Which of the fo…
- Assertion A current carrying conductor experiences a force in a magnetic field. Reason The net charge on a current carrying conductor is zer…
- A current of flowing along positive axis through a straight wire of length placed in a region of a magnetic field given by \) T. The magnitu…
- The horizontal component of earth's magnetic field at a certain place is and having a direction from the geographic south to geographic nort…
- are used in making electric generators and electric motors.…