JEE Main202131 Aug 2021Evening ShiftPhysicsMagnetic Effects of CurrentActual
A current of 1 . 5 A is flowing through a triangle, of side 9 cm each. The magnetic field at the centroid of the triangle is : (Assume that the current is flowing in the clockwise direction.)
Options
- A2 3 × 10 - 5   T , inside the plane of triangle
- B2 3 × 10 - 7   T , outside the plane of triangle
- C3 × 10 - 7   T , outside the plane of triangle
- D3 × 10 - 5   T , inside the plane of triangle
Correct answer
D. 3 × 10 - 5   T , inside the plane of triangle
Step-by-step solution
B 1 = μ 0 I 4 π R 2 sin 60 = 4 π × 10 - 7 × 1 . 5 4 π . 3 3 2 × 10 - 2 × 2 × 3 2 = 1 × 10 - 5 B n e t = 3 B 1 = 3 × 10 - 5 T ⊗