##### Which is a type of fundamental force? 15-21

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15. Which is a type of fundamental force?

a.friction

b.normal force

c.spring force

d.weak interaction

19. A person of mass 80 kg stands on Earth's surface. What is his weight?

20. Both magnetism and electricity result from which fundamental force?

21. An object is transported from Earth to deep space, far from any stars or planets. What happens to the mass and weight of the object?

May 18th, 2015

d.weak interaction=IS CORRECT

19=80*9.8=784N

20=

## 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.

May 18th, 2015

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May 18th, 2015
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May 18th, 2015
Aug 17th, 2017
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