If a wire of resistance R is melted and recast to half its length then what will be the new resistance of the wire?

If a wire of resistance R is melted and recast to half its length then

1.	If a wire of resistance R is melted and recast to half its length then what will be the new resistance of the wire?
A.	R
B.	R/2
C.	R/4
D.	>2R
Answer» D. >2R

Discussion

No Comment Found

Related MCQs

10 cells are connected in parallel with the internal resistance of 1 Ω and 1.5 Volts. the total voltage and total resistance is ______
In a meter bridge, the wire of length 1 m has a non-uniform cross section such that the variation \(\frac{{{\rm{dR}}}}{{{\rm{dl}}}}\) of its resistance R with length l is\(\frac{{dR}}{{dl}} \propto \frac{1}{{\sqrt l }}\). Two equal resistance are connected as shown in the figure. The galvanometer has zero deflection when the jockey is at point P. What is the length AP?
If 'τ' is the relaxation time, 'n' is the number of free electrons per unit volume in the conductor ('e' is charge and 'm' is mass of an electron) then, the term "ne2τ/m" is equal to the __________.
A coil of self-inductance 10 mH and resistance 0.1 Ω is connected through a switch to a battery of internal resistance 0.9 Ω. After the switch is closed, the time taken for the current to attain 80% of the saturation value is [take ln 5 = 1.6]
In a meter bridge experiment, the circuit diagram and the corresponding observation table are shown in figure.Sl. NoR (Ω)l (cm)1.1000602.100133.101.54.11.0Which of the reading is inconsistent?
Heat generated in a resistive wire at given time period is ___________
Direction of flow of electric current is from
If 'E' is magnitude of uniform electric field in a conductor, 'τ' is the relaxation time, ('e' is charge and'm' is mass of an electron) then, the term -eEτ/m is equal to the ______________ the electrons
In the given circuit diagram, the currents I1 = -0.3 A, I4 = 0.8 A and I5 = 0.4 A, are flowing as shown. The currents I2, I3 and I6 respectively, are
If resistance of a metal wire of length L and area of cross section A is given as R = L/σA, then σ represents ______________ of the material.

If a wire of resistance R is melted and recast to half its length then what will be the new resistance of the wire?

Discussion

No Comment Found

Related MCQs

Reply to Comment