MHT CET Physics question

A length L of a wire carries a steady current I. It is bent first to form circular plane coil of one turn. The same length is now bent more sharply to give a double loop of small radius the magnetic field at the centre, caused by the same current is:

• (A)A quarter of its first value
• (B)Four times its first valueCorrect
• (C)A half of its first value unaltered
• (D)None of these