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What is the use of optical fibre?

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As you know we use electrical cables to carry electrical signals while optical fiber carry optical signals. Previously cables were mostly used for these transmissions. Now a days we are using fiber because it is more economical its cost to carry the same no. of signals is less than cable. For this we...
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As you know we use electrical cables to carry electrical signals while optical fiber carry optical signals. Previously cables were mostly used for these transmissions. Now a days we are using fiber because it is more economical its cost to carry the same no. of signals is less than cable. For this we convert electrical signal to optical signal by LED (light emitting diode) transmit over Fiber. read less
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What is the difference between position vector and displacement vector?

Change in position vector is displacement.
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If force is acting on a moving body perpendicular to the direction of motion, then what will be its effect on the speed and direction of the body?
The magnitude of velocity shall decrease and direction shall be same till it comes to rest, afterwards it shall move in direction of force with acceleration due to the applied force.
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7

Fixity is always needed for rotational motion?

Yes for pure rotation, the distance between two particles will always remain constant.
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