MHT CET202123 Sep 2021Morning ShiftPhysicsMagnetic Effects of CurrentActual
Two long conductors, separated by a distance 'd' carry currents ' I₁ ' and ' I₂ ' in the same directions. They exert a force ' F ' on each other. Now the current in one of them is increased to two times and its direction is reversed. The distance is also increased to ' 3 ~d . The new value of the force between them is
Options
- A-2F
- B-F
- C- 2 ~F 3
- DF 3
Correct answer
C. - 2 ~F 3
Step-by-step solution
Force on each conductor is given by F = ₀ 4 I ₁ I ₂ ~d This force will be attractive. If the direction of current is reversed in one conductor, the force will become repulsive. F ^ =- ₀ 4 2 I ₁ I ₂ 3 ~d =- 2 3 ~F