KCET2013PhysicsMagnetic Effects of Current
In the diagram, I₁, I₂ are the strength of the currents in the loop and straight conductors respectively. O A=A B=R . The net magnetic field at the centre O is zero. Then the ratio of the currents in the loop and the straight conductos is
Options
- A2
- B1
- C1 2
Correct answer
3
Step-by-step solution
Given that the net magnetic field at the centre O is zero. Therefore, magnetic field at O due to circular coil and straight conductor must be equal and opposite in direction. ₀ l₁ 2 R = ₀ I₂ 2 (2 R) I₁ I₂ = 1 2