Two thin circular metal plates A and B ofradii 2 cm and 3 cm are kept in water at depths of 75 cm and 150 cm respectively below th e free surface of water. `F_A` and `F_B` are the thrusts on the plates A and B respectively. What is the ratio `(F_A)/(F_B)` ?

Spheres A and B have their radii 40 cm and 10 cm respectively. Ratio of surface area of A to the surface area of B is :

B — F bond length in B F_3 and B F_4 - are respectively

Radii of two thin circular discs are 3cm and 4cm respectively. Both the discs are placed at the same depth under a liquid. The ratio of thrusts on them will be

Two wires A and B are of same material. Their lengths are in the ratio 1:2 and diameters are in the ratio 2:1 when stretched by force F_A and F_B respectively they get equal increase in their lengths. Then the ratio (F_A)/(F_B) should be

Two plates of equal area are placed in contact with each other. The thickness of the plates are 2.0 cm and 3.0 cm respectively. The outer face of first plate is at -25^(@) C and that of second plate is at +25^(@) C . The conductivities of the plates are in the ratio 2:3 . Calculate the temperature of the common surface of the plates.

Two wires A and B are of same material. Their lengths are in the ratio 1:2 and diameters are in the ratio 2:1 when stretched byb force F_A and F_B respectively they get equal increase in their lengths. Then the ratio (F_A)/(F_B) should be

In DeltaABC , E and F are the midpoints of AB and AC respectively. If EF = 4 cm, then BC= ……….. Cm

Two current carying circular coils A and B, having the same number of turns are connected in series. What is the ratio of the magnetic inductions produced at their centres, in the diameters of A and B are 10 cm and 20 cm respectively ?

A circular plate of radius 4 cm and weight W is made to rest on the surface of water. If a minimum pull of W + F is required to clear the plate off the water surface then find F. Given surface tension of water S_(w) = 0.072 N m^(-1)

A circular plate of radius 4 cm and weight W is made to rest on the surface of water. If a minimum pull of W + F is required to clear the plate off the water surface then find F. Given surface tension of water S_(w) = 0.072 N m^(-1)