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A leaf electroscope is a simple apparatus to detect any charge on a body It...

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A leaf electroscope is a simple apparatus to detect any charge on a body It consist of two metal leaves OA and OB free to rotate about O Initially both leaves are very slightly separated When a charged object is touched to the metal knob at the top of the conducting rod charge flows from knob to the leaves through the conducting rod As the leaves are now charged similarly they start repelling each other and get separated deflected by certain angle The angle of deflection in static equilibrium is an indicator of the amount of charge on the charged boy Glass window Metal knob Metal rod Rubber B 2 Gold leaves O O A B A B 2 When a 20C rod is touched to the knob the deflection of leaves was 5 and when an identical rod of 40C is touched the deflection was found to be 9 If an identical rod of 30 C is touched then the deflection may be A 0 C 7 D 11

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