1. Atom is electrically neutral. Does it mean that an atom does not contain any electrical charge? Support your answer with a reason.
2. An ebonite rod and a glass rod are initially neutral. Suggest a possibility so that they can be attracted to each other. Mention the additional things you would use to make attraction possible.
3. a) State the law of electrostatic repulsion and attraction.
b) A scientist is investigating the charge on several objects and makes the following findings: Object C attracts Object B, Object D repels Object C, Object E attracts Object D, but repels Object F and Object F attracts Object A. The scientist also knows Object A is negatively charged and object B is electrically neutral. What can he conclude about the charges on objects C,D,E and F? Explain your answer.
4. Explain the working of a device which is used to protect the buildings from lightning with a neat labelled diagram.
5. a) State the principle on which the device that can be used to detect an electric charge works.
b) Name the device. Name the device . Draw a neat labelled diagram and explain its working.