WIRE

Two uniform wires of a the same material are vibrating under the same tension. If the first overtone of the first wire is equal to the second overtone of the second wire and radius of the first wire is twice the radius of the second wire, then the ratio of the lengths of the first wire to second wire is

A wire of length L and area of cross-section A, is stretched by a load. The elongation produced in the wire is I. If Y is the Young's modulus of the material of the wire, then the torce corstant of the wire is

Two wires are made of same metal. The length of the first wire is half that of the second wire and its diameter is double that of the second wire. If equal loads are applied on both wires, find the ratio of increases in their lengths.

[" Power developed in a uniform "],[" wire when connected to a "],[" certain cell of negligible internal "],[" resistance is "P" .If the wire is "],[" melted and recast in a wire of "],[" length double that of the original "],[" and the new wire is connected "],[" to the same cell,then the power "],[" developed in the wire would be: "]

A copper wire and a steel wire of the same length and same cross-section are joined end to end to form a composite wire. The composite wire is hung form a rigid support and a load is suspended form the other end. If the increses in length of the composite wire is 2.4mm . then the increases in lenghts of steel and copper wires are

In figure, a long wire AB is placed on a table. A wire CD 10cm long, is just above AB. It can slide up and down on two vertical wires. If the wires carry a current of 20A , then how much above AB, will the wire CD settle? The mass of the wire CD is 0*50 gram.

Three long parallel wires AB, CD and EF of equal resistance are connected as shown in figure. The separation between the neighbouring wires is 2*0cm and wires AE and BF supplied to the wires and ammeter reads 12A . (a) or wire AB (b) of wire CD.

What is the effect on the magnetic needle in Oersted's experiment, when (1) a current is passed through the wire (2) the current through the wire is increased (3) The current through the wire to stopped (4) The current through the wire is reversed (5) The distance between jthe magnetic needle and the wire is increased , keeping the current through the wire constant ?

There are two infinite parallel current carrying wires in vertical plane. Lower wire is fixed and upper wire is having a linear mass density lambda . Two wires are carrying currents I_(1) and I_(2) . Now upper wire is placed in a magnetic field produced by lower wire. Magnetic field due to lower wire at the location of upper wire is (mu_(0)I)/(2pid) , where I_(1) current lower wire, d separation between wires. Force on any small portion of upper wire having length dl is dF=(mu_(0)I_(1)I_(2)dl)/(2pid), where I_(2) current in the upper wire. If directions of current in the wires is appropriate then upper wire can be in equilibrium if its weight is balanced by magnetic force. Now answer the following questions. Equilibrium separation between the two wires is