Two circular coils 1 and 2 have both their radii and number of turns in the ratio 1 : 2. If the currents in them are in the ratio 2: 1, the magnitudes of the magnetic inductions at the centres of the coils are in the ratio
A. 1 : 1
B. 2 : 1
C. 1 : 2
D. 1 : 8.
Answer:B
Two circular coils 1 and 2 have both their radii and number of turns in the ratio 1 : 2. If the currents in them are in the ratio 2: 1, the magnitudes of the magnetic inductions at the centres of the coils are in the ratio
A. 1 : 1 B. 2 : 1 C. 1 : 2 D. 1 : 8.