COMEDK202510 May 2025Morning ShiftPhysicsMagnetic Effects of CurrentActual
Two very long, straight, parallel wires carry steady currents I and 2I respectively. The distance between the wires is d. At a certain instant of time, a point charge q is at a point equidistant from the two wires, in the plane of the wires. Its instantaneous velocity is v perpendicular to this plane. The magnitude of the force due to the magnetic field acting on the charge at this instant is
Options
- A_o I q v d
- B2 _o I q v d
- C_o I q v 2 d
- Dzero
Correct answer
D. zero
Step-by-step solution
The magnetic field due to both wires at any point in the plane of the wires is perpendicular to that plane. The velocity v of charge q is also perpendicular to the plane of the wires. Since v and B are both perpendicular to the same plane, they are collinear (parallel or anti-parallel), so = 0° or 180° . F = qvB = qvB 0 = 0