1.

Two long, thin, parallel conductorsare keptvery closeto each other , without touching . One carries a current I,and the otherhas chargelambdaper unitlength. An electron movingparallelto the conductorsis undeflected.Let c bethe velocityof lightand v be the velocity of electron, then

Answer»

`v = (lambdac^(2))/(I)`
`v = I/lambda`
`c= I/lambda`
the electron may be any distance from the conductor.

Solution :At, P , electric FIELD ,
` E = lamda/( 2 pi in_(0)x)` ( to the RIGHT ) .
and magneticfield, B ` (mu_(0)I)/(2 pi x)`
FORNO deflection, ` E = VB = orv= E/B `
` or v=lamda/(2 pi in_(0)) xx (2 pi x)/(mu 0 I) = ( lamda)/I 1/(in_(0) mu_(0))= (lamdac^(2))/(I)`


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