The magnetic field due to a current carrying circular coil on the axis, at a large distance r from the centre of the coil, varies approximately as-
A. \(\frac { 1 }{ r }\)
B. \(\frac { 1 }{ { r }^{ \frac { 3 }{ 2 } } } \)
C. \(\frac { 1 }{{ r }^{3}}\)
D. \(\frac { 1 }{{ r }^{2}}\)
Answer:C
The magnetic field due to a current carrying circular coil on the axis, at a large distance r from the centre of the coil, varies approximately as-
A. \(\frac { 1 }{ r }\) B. \(\frac { 1 }{ { r }^{ \frac { 3 }{ 2 } } } \) C. \(\frac { 1 }{{ r }^{3}}\) D. \(\frac { 1 }{{ r }^{2}}\)