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 . Thermal power developed in the circuit.

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 . Thermal power developed in the circuit.
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 :a

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