With the help of a diagram, show the lines of force due to an isolated
negative charge.

With the help of a diagram, show the lines of force due to an isolated positive charge

The electric lines of force due to an isolated negative charge is

With the help of a diagram, show the lines of force due to two equal and opposite charges.

The electric lines of forces due to an isolated positive point charge are

With the help of a diagram explain the structure of DNA.

The shape of the magnetic lines of force due to an infinite, long, straight current carrying conductor is