NEET Class neet Answered
please answer this
Asked by Prashant DIGHE | 06 Dec, 2019, 22:31: PM
Expert Answer
Figure shows a charged ring of radius R rotating with linear speed about axis OP.
Let a charge q is distributed uniformly, so that the ring has linear charge density λ per unit length.
Let us consider a small element of length dl at A. Electroc fileld dE at P due to this element of length dl is given by
dE = ( λ dl ) / [ (4πεo) 2R2 ]
Direction of this field is along the direction of line AP. The component resolved along the line OP is dE cos45 .
Hence electric field in the direction of line OP is given by, dE = (1/√2 ) ( λ dl ) / [ (4πεo) 2R2 ] .............(1)
electric field E in the direction of line OP due to full ring is obtained by integrating eqn.(1) through whole length of ring
E = (1/√2 ) ( λ 2πR ) / [ (4πεo) 2R2 ] = [1/( 2√2 )] { q / [ (4πεo) 2R2 ] } ....................(2)
magnetic field at P due to rotation of charged ring is calculated as follows.
Equivalent current of rotating charged ring = charge passing through the cross section of wire per unit time
Equivalent current i = q / [ (2πR)/v ] = λv.................(3)
Magnetic field dB by Biot_Severt's law at P due to line element dl is given by,
dB = [ ( μo/4π) i dl sin 45 ]/ ( 2R2 ) ...........................(4)
Magenetic flux density due to whole ring is obtained by integrating eqn.(4)
B = (1/2√2) [ ( μo/4π) λv 2πR ]/ ( R2 ) = (1/2√2) [ ( μo/4π) q v ]/ ( R2 ) ..........................(5)
Substitution for current is done in the above equation using eqn.(3)
from eqn.(2) and (5) , we get the ratio of electric field to magnetic flux density is given by
( E / B ) = 1 / ( μo εo v ) = c2 / v
Answered by Thiyagarajan K | 08 Dec, 2019, 14:08: PM
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