d.weak interaction=IS CORRECT
Electricity and magnetism
Both electric and magnetic interactions are elements of a single phenomenon called electromagnetism. There are four fundamental forces: the strong force, the weak force, gravitation and the electromagnetic force. The field of electromagnetism deals with how electrically charged particles interact with each other and with magnetic fields.
James Clerk Maxwell developed a unified theory of electromagnetism in 1873. There are four main electromagnetic interactions:
- The force of attraction or repulsion between electric charges is inversely proportional to the square of the distance between them.
- Magnetic poles comes in pairs that attract and repel each other much as electric charges do.
- An electric current in a wire produces a magnetic field whose direction depends on the direction of the current.
- A moving electric field produces a magnetic field, and vice versa.
Maxwell developed a set of formulas, called Maxwell's equations, to describe these phenomena.
21=MASS REMAINS CONSTANT WHILE WEIGHT WILL CHANGE AS THE VALUE OF GRAVITY CHANGES.
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