Transverse waves of the same frequency are generated in two steel wires A and B. The diameter of A is twice that of B and the tension in A is half that in B. The ratio of the velocities of the waves in A and B is
In the diagram shown below, both the strings AB and CD are made of same material and have same cross-section. The pulleys are light and fictionless. If the speed of wave in string AB is v1 and in CD is v2, then $${{{v_1}} \over {{v_2}}}$$ is

What will be the acceleration due to gravity at a depth d, where g is acceleration due to gravity on the surface of earth?
A direct current of 6 A is superimposed on an alternating current I = 10 sin $$\omega$$t flowing through a wire. The effective value of the resulting current will be
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