How can you charge gold leaf electroscope positively by conduction ?

How do you charge a gold leaf electroscope negatively by induction?

How can you charge a metal sphere positively without touching it?

When a glass rod rubbed with silk is brough near the knob of a positively charged gold leaf electroscope , the gold leaves

If a body touching the disc of an uncharged gold leaf electroscope makes its leaves .................. we can say that body is charged.

What will happen to the leaves of an electroscope if a positively charged body is brought near (a) An uncharged electroscope ? (b) A positively charged electroscope ? ( c ) A negatively charged electroscope ?

How can you charge a metal sphere negatively without touching it?

How can you obtain lamp black?

A positively charged body is brought near to bob of an uncharged gold leaf electroscope , then :

A glass rod rubbed with silk is used to charge a gold leaf electroscope and the leaves are observed to diverge. The electroscope thus charged is exposed to X -rays for a short period. Then

A negatively charged rod is held close to the disc of a neutral gold leaf electroscope. What kind of charge is produced on the disc gold leaves ?