Two conducting rods when connected between two points at constant but different temperatures separately, the rate of heat flow through them is `q_1 and q_2`.

When two bodies at different temperature are kept in contact. Net heat flow takes place between them till-

Two cylindrical rods of same meterial have the same temperature difference between their ends. The ratio of rates of flow of heat through them is 1 : 8. The ratio of the radii of the rods are 1 : 2. What is the ratio of their lengths ?

Two conductors AB and CD are connected between two parallel resistors in such a way that no current flows through them. Then a wire is connected between between E and F .

A and B are two points on uniform metal ring whose centre is O The angle AOB =theta A and B are maintaind at two different constant temperatures When theta =180^(@) the rate of total heat flow from A to B is 1.2W When theta =90^(@) this rate will be .

Five rods of same dimensions are arranged as shown in the figure. They have thermal conductivities k_(1),k_(2),k_(3) and k_(5) . When points A and C are maintained at different temperature, no heat flows through the central rod if

The heat is flowing through two cylinderical rods of same material. The diameters of the rods are in the ratio 1:2 and their lengths are in the ratio 2:1 . If the temperature difference between their ends is the same, the ratio of rates of flow of heat through them will be

Two conducting spheres of radius R and 3R carry charges Q and -2 Q . Between these spheres a neutral conducting sphere of radius 2R is connected. The separation between the sphere is considerably large Charge flows through conducting wire due to potential difference. The final charge on initially neutral conducting sphere is :

The lengths and radii of two rods made of same material are in the ratios 1 : 2 and 2 : 3 respectively. If the temperature difference between the ends for the two rods be the same, then in the steady state, the amount of heat flowing per second through them will be in the ratio