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Q.

An electroscope is


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a

An instrument used to measure electricity

b

An instrument used to detect electric charge

c

An instrument used to measure gravity

d

None of the above  

answer is B.

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Detailed Solution

An electroscope is an instrument used to detect electric charge.
 The presence of electric charge on any object can be detected by means of electrostatic attraction and repulsion.
Electroscope contains two metallic (aluminium) foils or strips that are closely placed. When both the foils and strips are charged with like charges, they repel each other and become wide on.
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