If a copper wire is increased to double its length, its resistance will become
A). Four times
B). Onefourth
C). Double
D). Half
Four times
When the wire is stretched to double the length , the area of cross section gets reduced to half. So when the wire is stretched, the resistance multiplies by four times.
1. In MRI machine which one Of the following is used
2. ?Instrument used to study the behavior of a vibrating string is:
3. Quality of a musical note depends on
4. Magnetism in materials is due to
5. Sound waves cannot travel through
6. Force of impact is the force
7. When a ship enters the sea from a river
8. What do you mean by 'Density of Population'?
9. Convex and concave mirrors are examples of?
10. Which among the following determines the pitch of a sound?