Two objects when rubbed together get charged. The charges on them are:

1. equal and opposite
2. equal and similar
3. unequal and similar
4. unequal and opposite

When a glass rod is rubbed with silk, the glass rod and the silk get charged because:

1. electrons are transferred from the silk to the glass rod
2. electrons are transferred from the glass rod to the silk
3. protons are transferred from the silk to the glass rod
4. protons are transferred from the glass rod to the silk

A gold leaf electroscope is to be charged positively by conduction. For this:

1. a positively charged rod is held close to the disc of electroscope
2. a positively charged rod is placed in contact with the disc of electroscope
3. a negatively charged rod is held close to the disc of electroscope
4. a negatively charged rod is touched with the disc of electroscope

A glass rod rubbed with silk is touched with the disc of a negatively charged gold leaf electroscope. The divergence of leaves will:

1. decrease
2. increase
3. remain unchanged
4. first decreases and then increases