jee-main 2013 Q20

jee-main · India · 09apr Not Maths
An electric current is flowing through a circular coil of radius $R$. The ratio of the magnetic field at the centre of the coil and that at a distance $2 \sqrt { 2 } R$ from the centre of the coil and on its axis is :
(1) $2 \sqrt { 2 }$
(2) 27
(3) 36
(4) 8 
An electric current is flowing through a circular coil of radius $R$. The ratio of the magnetic field at the centre of the coil and that at a distance $2 \sqrt { 2 } R$ from the centre of the coil and on its axis is :\\
(1) $2 \sqrt { 2 }$\\
(2) 27\\
(3) 36\\
(4) 8
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