1.

The magnetic field strength B at the point between the capacitor plates is indicated in figure. B in terms of the rate of charge of the electric field strength, i.e., dE/dt between the plates is equal to

Answer»

`(MU _(0))/( 2pi r ) (dE)/(dt)`
`(EPSI _(0) mu _(0)r)/(2) (dE)/(dt)`
Zero
`(mu_(0))/(2r) (dE)/(dt)`

Solution :`B = (mu _(0))/( 4pi ) (2 I _(D))/( r ) = (mu _(0) )/( 4pi ) 2/r XX epsi _(0) (d phi E)/( dt)`
`= (mu _(0))/( 2pi r ) epsi _(0) (d )/(dt) (E pi r ^(2)) = (mu_(0) epsi _(0) r )/(2) (dE)/(dt)`


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