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 . Force required on each wire to keep its velocity constant .

In the figure shown the four rods have lambda resistance per unit leng

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 . Force required on each wire to keep its velocity constant .
Answer» `(B^(2)v)/(LAMBDA) ( l + 2vt)` `(B^(2)v)/(lambda) ( l - VT)` zero `(B^(2)v)/(lambda) ( l - 2vt)` ANSWER :d

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