The protein cost called capsied made of small subunits called capsomeres are present in

Options

A. `(sqrt(3))/(2pi)`
B. `(2sqrt(3))/(pi)`
C. `(3sqrt(3))/(2pi)`
D. `(3sqrt(3))/(2sqrt(2)pi)`

Answer

C

Explanation

If `l_(1)` and `l_(2)` be the current in circular and straight parts respectively, and `B_(1)`
`B_(2)` the magnetic fields due to them at centre is
`B_(1)=(mu_(0)I_(1))/(2R)xx2/3=(mu_(0)I_(1))/(3R)` downwards
`B_(2)=(mu_(0)I_(2))/(4pi[R cos 60^(@)])[2 cos 30^(2)]=(sqrt(3)mu_(0)I_(2))/(2piR)` upwards
For the field at O to be zero
`(mu_(0)I_(1))/(3R)=(sqrt(3)mu_(0)I_(2))/(2piR)implies(I_(1))/(I_(2))=(3sqrt(3))/(2pi)`