JEE Main2012PhysicsMagnetic Effects of CurrentActual
Currents of a 10 ampere and 2 ampere are passed through two parallel thin wires A and B respectively in opposite directions. Wire A is infinitely long and the length of the wire B is 2 ~m . The force acting on the conductor B , which is situated at 10 ~cm distance from A will be
Options
- A8 10⁻⁵ ~N
- B5 10⁻⁵ ~N
- C8 10⁻⁷ ~N
- D4 10⁻⁷ ~N
Correct answer
A. 8 10⁻⁵ ~N
Step-by-step solution
Force acting on conductor B due to conductor A is given by relation F= ₀ I₁ I₂ l 2 r l -length of conductor Br -distance between two conductors F= 4 10⁻⁷ 10 2 2 2 0.1 =8 10⁻⁵ ~N