Physics - Magnetism Question with Solution | TestHub
Three infinite straight wires and C carry currents as shown in figure. The resultant force on wire B is directed
Options:
Answer:
Solution:
The force between two parallel current-carrying wires is attractive if the currents are in the same direction and repulsive if they are in opposite directions.
For wires A and B, the currents are in the same direction (downwards). Therefore, wire A attracts wire B. The force on wire B due to wire A is directed towards A.
For wires B and C, the currents are in opposite directions (wire B is downwards, wire C is upwards). Therefore, wire C repels wire B. The force on wire B due to wire C is directed away from C, which is also towards A.
Since both the forces acting on wire B (due to wire A and wire C) are directed towards A, the resultant force on wire B is directed towards A.
Answer: towards A
