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An electric motor winds 200 turns of a t...

An electric motor winds 200 turns of a thin coper wire on a unifrom of diameter 10 cm, in 2 seconds.then the length of the wire that is wound over the rod in one second is _______ m.

A

30

B

` 10 pi`

C

`20 pi`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
Number of turns wound over rod = 200
Diameter of the, rod (d) = 10 cm
R= 5cm = 0.05 m
Time taken to wind, (t) = 2s
Length of the wire wound in one second = ` ("distance")/("time")`
` (200 xx 2pir)/2 = ( 200 xx 2pi xx 0.05)/ 2 =10 pi m`
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