1.

In the figure shown the four rods have lambda resistance per unit length . The arrangement is kept in a magnetic field of constant magnitude B and directed perpendicular to the plane of the figure and direction inwards . Initially the sides as shown form a square . Now each wire starts moving with constant velocity v towards opposite wire . Find as a function of time . Total power required to maintain constant velocity .

Answer»

`(4B^(2)v^(2))/(LAMBDA) ( L + 2vt)`
`(4B^(2)v^(2))/(lambda) ( l - VT)`
`(4B^(2)v^(2))/(lambda) ( l -2 vt)`
`(B^(2)v^(2))/(lambda) ( l - 2vt)`

Answer :C


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