Physics

any two bodies attract each other with a force which is proportional to the difference of their masses

any two bodies attract each other with a force which is inversely proportional to the square of the distance between them

any two bodies attract each other with a force which is proportional to the product of their masses and inversely proportional to the square of the distance between them

any two bodies attract each other with a force which is proportional to the square of the distance between them

any two bodies attract each other with a force which is proportional to the sum of their masses

positive charge means deficit electrons

negative charge means excess of electrons

electric current means movement of electrons

all of the above

A and B only

the atoms of the differnt element differ only in the number of protons and electrons

the num,ber of protons equals the number of electrons

atoms are constructed according to the plan of our solar system

all of the above

A and C only

atoms are indestructible

all atoms of a pure substance, or elements are identical

atoms of different substance have different weights

all of the above

A and B only

it consists of two opposite poles - the north and south poles

the earth's magnetic field has a south pole near the geographical north pole and a north pole near the geographical south pole

the force of attraction and repulsion between opposite and between like poles obeys a law for electrostatic charges

A and B only

A and C only