A wire is stretched under a force. If th...

A wire is stretched under a force. If the wire suddenly snaps the temperature of the wire

remains the same

decreases

increases

first decreases and then increases

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A 20 kg load is suspended from a copper wire of radius 1 min. If the wire suddenly snaps, does its temperature change? Calculate this change in temperature. For copper Young's modulus =12xx10^(10)"N.m"^(-2), density ="9000 kg.m"^(-3) , specific heat = "100 cal.kg"^(-1).K^(-1) . Mechanical equivalent of heat = "4.2 J.cal"^(-1),g=9.8m.s^(-2) .

A wire of uniform cross section has a resistance of 9 Omega . It is cut into three equal pieces. Each piece is stretched uniformly to three times its length and all the three stretched pieces are connected in parallel.Assuming that stretching of wire does not cause any change in density of their material ,calculate the total resistance of the combination described.

A metallic wire has a definite resistance . IF the wire is stretched in such a way that its length becomes doubled then what will be the resistance of the wire? Consider the volume and the resistivity of the wire remains unchanged.

One end of a horizontal thick copper wire of length 2 L and radius 2R is welded to an end of another horizontal thin copper wire of length L and radius R. When the arrangement is stretched by applying forces at two ends, find the ratio of the elongation in the thin wire to that in the thick wire.

If a conducing wire is stretched to make itself twice longer then what change in the resistance of the wire will be seen if its resistivity and volume remain unchanged ?

When a stretched wire is snapped it undergoes a change in temperature. Why?

A wire of resistivity rho is stretched uniformly so that its length becomes four times. What is its new resistivity? (Assume temperature of the wire remains constant during stretching of the wire).

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