An electric motor winds 200 turns of a thin copper wire on a uniform rod of diameter 10 cm , in 2 seconds . Then the length of the wire that is wound over the rod is one second is _m.
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The length of the wire that is wound over the rod in one second is 10 πm
Given-
- Number of turns wound over the rod = 200
- Diameter of rod = 10 cm
- Radius of the rod = 5 cm = 0.05 m
- Time = 2 seconds
Distance is equals to the circumference
Distance = 2πr = 2π (0.05) = 0.1 π m
Length of the wire in one second is = distance/ time
Length = N × 2πr/2
Length = 200 ×0.1 π /2 = 10 πm.
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3
Answer:
10πm
Explanation:
the radius = 10/2 = 5
the circumference = 2xπx5
= 10π
this is for one second
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