Question

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.

Answer 1

The length of the wire that is wound over the rod is one second is 31.14 m.

Circumference of rod is 2πr.

Hence, 2*π*5 = 31.41 cm.

So length of wire in one round will be 31.41 cm.

Now, given is that in 2 seconds 200 turns are made.

Therefore, in one second, 100 turns will be made.

Length of wire wound in 1 second will be equal to 100 turns.

Hence, length of wire will be = 31.41*100

Length of wire = 3141.59cm or 31.41m.

Answer 2

Answer:

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