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Magnetic Flux and Magnetic Flux Density

A Point sourc...

Question

A Point source generates 10 J of light energy in 2 s. The luminous flux of source is:

5 lumen

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10 lumen

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50 lumen

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none of these

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Solution

The correct option is B 5 lumen
The luminous flux of source is the rate at which light energy flows from the source:
luminous flux =10 J/ 2 s= 5 lumen.
so the correct option is A.

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