A wire of length L is first formed into a loop of one turn and then as a loop of two turns. The same current I is passed through the wire in the two cases. The ratio of the magnitude of the magnetic field induction at the centre of the single-turn loop to that at the centre of the double-turn loop is
A. 4
B. 2
C. \(\frac{1}{2}\)
D. \(\frac{1}{4}\)
Answer:D
A wire of length L is first formed into a loop of one turn and then as a loop of two turns. The same current I is passed through the wire in the two cases. The ratio of the magnitude of the magnetic field induction at the centre of the single-turn loop to that at the centre of the double-turn loop is
A. 4 B. 2 C. \(\frac{1}{2}\) D. \(\frac{1}{4}\)