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Last Updated On 01-06-2023 - By Jeesha Sara

A copper wire is stretched to make it 0.5% longer. The percentage change in its electrical resistance if its volume remains unchanged is:

a.

2.5%

b.

0.5%

c.

1.0%

d.

2.0%


Question ID - 50048 :-

A copper wire is stretched to make it 0.5% longer. The percentage change in its electrical resistance if its volume remains unchanged is:

a.

2.5%

b.

0.5%

c.

1.0%

d.

2.0%

1 Answer
5876 Votes
3537

Answer Key : (c) -

R= and volume (v) = Al.

R=

  = =1%



Next Question :

A parallel plate capacitor is made of two square plats of side ‘a’, separated by a distance d (d<<a).  The lower triangular portion is filled with a dielectric of dielectric constant K, as show in the figure. Capacitance of this capacitor is:

a.

 

b.

ln K

c.

 

d.

 


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