Two plates identical in size, one of black and rough surface `(B_1)` and the other smooth and polished `(A_2)` are in terconnected by a thin horizontal pipe with a mercury pellet at the centre. Two more plates `A_1` (identical to `A_2`) and `B_2` (identical `B_1`) are heated to the same temperature and placed closed to the plates `B_1`, and `A_2` shown in Fig. The mercury pelletA. moves to the rightB. moves to the leftC. remains stationaryD. starts oscillating left and right

Two plates identical in size, one of black and rough surface `(B_1)`

1.	Two plates identical in size, one of black and rough surface `(B_1)` and the other smooth and polished `(A_2)` are in terconnected by a thin horizontal pipe with a mercury pellet at the centre. Two more plates `A_1` (identical to `A_2`) and `B_2` (identical `B_1`) are heated to the same temperature and placed closed to the plates `B_1`, and `A_2` shown in Fig. The mercury pelletA. moves to the rightB. moves to the leftC. remains stationaryD. starts oscillating left and right
Answer» Correct Answer - C Smooth and polished plates are poor radiators of heat. Hence, heat coming out from A is small, even though B being a black and rough plate is a good absorber. Effectively the heat coming to the left of pellet P is small. Black and rough plates are good radiators of heat. Hence plate `B_2` radiates heat to a satisfactory level , however plate `A_2` being smooth and polisher, is a bad absorber.Effectively the heat coming to the right of P is also small.

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