MHT CET2009PhysicsMagnetic Effects of Current
A long wire carries a steady current. It is bent into a cirde of one turn and the magnetic field at the centre of the coil is B . It is then bent into a circular loop of n turns. The magnetic field at the centre of the coil for same current will be
Options
- An B
- Bn² B
- C2 n B
- D2 n² B
Correct answer
B. n² B
Step-by-step solution
Magnetic field at the centre of single turn loop B= ₀ 4 2 I r , magnetic field at the centre of n turn loop aligned & B_ n = [ ₀ 4 2 I r / n ] n B_ n &=n² B aligned