Two identical slabs are welded end to end and `20cal` of heat flows through if for `4min` If the two slabs are now welded by placing them one through two ends under the same difference of temperatures the time taken is .

Two identical metal plates are welded end to end as shown in - (i) . 20 cal of heat flows through it in 4 minutes. If the plates are welded as shown in figure-(ii) , find the time (in minutes) taken by the same amount of heat to flow through the plates.

Two identical metal plates are welded end to end as shown in - (i) . 20 cal of heat flows through it in 4 minutes. If the plates are welded as shown in figure-(ii) , find the time (in minutes) taken by the same amount of heat to flow through the plates.

Two identical metal plates are welded end to end as shown in - (i) . 20 cal of heat flows through it in 4 minutes. If the plates are welded as shown in figure-(ii) , find the time (in minutes) taken by the same amount of heat to flow through the plates.

Two identical square rods of metal are welded end to end as shown in fig (1) . 20 cal of heat flows through it in 4min . If the rods are welded as shown in fig. (2) , the same amount of heat will flow through the rods in

Two identical square rods of metal are welded end to end as shown in figure (i), 20 calories of heat flows through it in 4 minutes. If the rods are welded as shown in figure (ii), the same amount of heat will flow through the rods in