Manipal MET2014PhysicsMagnetic Effects of Current
A wire in the form of a square of side a carries a current i . Then, the magnetic induction at the centre of the square wire is (magnetic permeability of free space = ₀ ).
Options
- A₀ i 2 a
- B₀ i 2 a
- C2 2 ₀ i a
- D₀ i 2 a
Correct answer
C. 2 2 ₀ i a
Step-by-step solution
Magnetic field due to one side of the square at centre O . array ll B₁= ₀ 4 2 i 45^ a / 2 & B₁= ₀ 4 2 2 i a array Hence, magnetic field at centre due to all sides B_ net =4 B₁= ₀(2 2 i) a