Which of the following option is correct?

For an ideal machine, the work done by the machine is always equal to the work done on it.

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For an ideal machine, the work done by the machine is always greater than the work done on it.

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For an ideal machine, the work done by the machine is always less than the work done on it.

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For an ideal machine, the work done by the machine is never equal to the work done on it.

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Solution

The correct option is A
For an ideal machine, the work done by the machine is always equal to the work done on it.

When an energy is supplied to a machine, it is able to do some useful work. The useful work done by the machine is always less than the work done on it. But, for an ideal machine, the work done by the machine is always equal to the work done on it.

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The efficiency of a machine is the ratio of the work done on the ___ by the machine to the work done on the machine by the effort.

The efficiency of a machine is the ratio of the work done on the load by the machine to the work done on the machine by the effort.

If the efficiency of a machine is $10 %$ and the work done on a machine is $2000 J$ , then what is the work done by the machine?

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