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Which of the following forces are the examples of non-contact forces?

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Important Questions on Force and Pressure

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Science>Physics>Force and Pressure>Non-contact Forces
Calculate the number of electrons constituting one coulomb of charge.
MEDIUM
Science>Physics>Force and Pressure>Non-contact Forces
A body has a negative charge of 1 μc. It means the body has gained:
EASY
Science>Physics>Force and Pressure>Non-contact Forces
Write two uses of magnets.
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Science>Physics>Force and Pressure>Non-contact Forces
Why does a freely suspended magnet point in the north-south direction?
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Science>Physics>Force and Pressure>Non-contact Forces
A magnetic compass is a device which is widely used by the sailors.
MEDIUM
Science>Physics>Force and Pressure>Non-contact Forces
Magnets are used in maglev trains. Explain.
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Science>Physics>Force and Pressure>Non-contact Forces
Before the invention of a compass, sailors used stars to find direction. In what way is using compass better?
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Science>Physics>Force and Pressure>Non-contact Forces
What is a magnetic compass? 
MEDIUM
Science>Physics>Force and Pressure>Non-contact Forces
A current of 1.6 mA flows through a conductor. If charge on an electron is -1.6×10-19 coulomb, find the number of electrons that will pass each second through the cross section of that conductor.
EASY
Science>Physics>Force and Pressure>Non-contact Forces
Magnets should not be placed near a:
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Science>Physics>Force and Pressure>Non-contact Forces
A freely suspended bar magnet comes to rest in the
MEDIUM
Science>Physics>Force and Pressure>Non-contact Forces
Magnetite is a type of mineral that can attract iron.
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Science>Physics>Force and Pressure>Non-contact Forces
_____ is the force exerted by a magnet on magnetic substances.
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Science>Physics>Force and Pressure>Non-contact Forces
List two properties of a magnet.
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Science>Physics>Force and Pressure>Non-contact Forces
List the various shapes of magnets that you can find.
MEDIUM
Science>Physics>Force and Pressure>Non-contact Forces
How will you prepare your own magnetic compass?
MEDIUM
Science>Physics>Force and Pressure>Non-contact Forces
Find out and explain the usefulness of a compass in finding directions.
EASY
Science>Physics>Force and Pressure>Non-contact Forces

Explain the term:

Compass

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Science>Physics>Force and Pressure>Non-contact Forces

(a) Name two magnetic poles which attract each other.

(b) Name two magnetic poles which repel each other.

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Science>Physics>Force and Pressure>Non-contact Forces
Why does the door of refrigerator left slightly open, shut automatically?