A wire stretches by a certain amount under a load. If the load and radius both increased to four times, find the streatch caused in the wire.

A wire stretched a certain amount under a load. If the load and diameter are both increased to three times, find the stretched caused in the wire.

Two wires are made of the same metal .The length of teh 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 increase in their lengths.

The electric resistance of a certain wire of ron is R. If its length and radius are both doubled, then

A rectangular loop of wire of size 4 cm xx 10 cm carries a steady current of 2A. A straight long wire carrying 5A current is kept near the loop If the loop and the wire are coplanar, find (i) the torque acting on the loop and (ii) the magnitude and direction of the force on the loop due to the current carrying wire(fig).

A metallic wire carrying a current I is bent into the form as shown in the figure. The circular portion ABC of the wire is of radius r and the straight portion AC subtends an angle 2theta at the centre O. Find the magnetic field due to the conductor at point O. If the radius of the curved path is r, find the magnetic field at the centre O.

A wire of length L and radius r is clalmped rigidly at one end. When the other end of the wire is pulled by force f, its length increaes by l. Another wire of the same material of length 2 L and radius 2 r, is pulled by a force 2 f. Find the increase in length of this wire.

A sitar wire is replaced by another wire of same length and material but of three times the earlier radius.If the tension in the wire remains the same,by what factor will the frequency change?

For the reaction A + 2B rarr C , the reaction rate is doubled if the concentration of A is doubled. The rate is increased by four times when concentrations of both A and B are increased by four times. The order of the reaction is

A circular metal plate expands under heating so that its radius increases by 2%. Find the approximate increase in the area of he plate if the radius of the plate before heating is 10 cm.