Why are coal and salt added to the pit in the ground?

Choose the correct option and fill in the blanks. (always repulsion, always attraction, displacement of negative charge, displacement of positive charge, atom, molecule, steel, copper, plastic, inflated balloon, charged object, gold) There is _____between like charges.

Choose the correct option and fill in the blank.

(always repulsion, always attraction, displacement of negative charge, displacement of positive charge, atom, molecule, steel, copper, plastic, inflated balloon, charged object, gold)

 _____ is responsible for generation of electric charge in an object.

Choose the correct option and fill in the blank.

(always repulsion, always attraction, displacement of negative charge, displacement of positive charge, atom, molecule, steel, copper, plastic, inflated balloon, charged object, gold)

A lightning conductor is made of a _____ strip.

Choose the correct option and fill in the blank.

(always repulsion, always attraction, displacement of negative charge, displacement of positive charge, atom, molecule, steel, plastic, inflated balloon, charged object)

_____does not get electrically charged easily by rubbing.

Choose the correct option and fill in the blank.

(always repulsion, always attraction, displacement of negative charge, displacement of positive charge, atom, molecule, steel, copper, plastic, inflated balloon, charged object, gold). 

There is _____when opposite electric charges come near each other.

Choose the correct option and fill in the blanks. (atom, molecule, steel, copper, plastic, inflated balloon, charged object, gold).

A _____ can be detected with an electroscope.