MHT CET20239 May 2023Evening ShiftPhysicsMagnetic Effects of CurrentActual
The magnetic field at a point P situated at perpendicular distance ' R ' from a long straight wire carrying a current of 12 ~A is 3 10⁻⁵ ~Wb / m ^2 . The value of ' R ' in mm is [ ₀=4 10⁻⁷ ~Wb / Am ]
Options
- A0.08
- B0.8
- C8
- D80
Correct answer
D. 80
Step-by-step solution
Using Biot-Savart's Law, aligned B & = ₀ I 2 R R & = ₀ I 2 B & = 4 10⁻⁷ 12 2 3 10⁻⁵ & =8 10⁻² ~m & =80 ~mm aligned