COMEDK2017PhysicsMagnetic Effects of Current
Three long, straight and parallel wires, carrying current, are arranged as shown in figure. The force experienced by a 25 ~cm length of wire C is
Options
- A10⁻³ ~N
- B25 10⁻³ ~N
- CZero
- D15 10⁻³ ~N
Correct answer
C. Zero
Step-by-step solution
Force on 25 ~cm length of wire C due to wire D is aligned F_ D &= ₀ 4 2 I ₁ I₂ r l &=10⁻⁷ 30 10 2 3 10⁻² 25 10⁻² &=5 10⁻⁴ ~N , towards right aligned Force of 25 ~cm length of wire C due to wire G is aligned F_ G &=10⁻⁷ 2 20 10 2 10⁻² 25 10⁻² &=5 10⁻⁴ ~N , towards left aligned Net force on wire C=F_ D -F_ G =0