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An electric bulb of 314 watt is at a dis...

An electric bulb of 314 watt is at a distance of 10cm from a point. If the efficiency of bulb is 50% then intensity at that point is

A

A. `1.25×10^3 W/m^2`

B

B. `2.25×10^3 W/m^2`

C

C. `2.50×10^3 W/m^2`

D

D. `5×10^3 W/m^2`

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Knowledge Check

  • Two point charges of 1muC and -1muC are separated by a distance of 100 Å. A point P is at a distance of 10 cm from the midpoint and on the perpendicular bisector of the line joining the two charges. The electric field at P will be

    A
    `9NC^(-1)`
    B
    `0.9NC^(-1)`
    C
    `90NC^(-1)`
    D
    `0.09NC^(-1)`

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