GEOLOGY

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EARTH SCIENCE

MAGNETISM

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A group of students was discussing whether the concept of magnetic fields is just a theory or if magnetic forces can be shown to exist between objects that are not touching. Some of the students were convinced that these forces only exist in theory while the rest of the students decided to prove that these forces actually exist.How can the students prove that magnetic forces exist between objects that are not touching each other?
A
Place two bar magnets on a table six inches apart with similar poles facing each other.
B
Place two bar magnets on a table six inches apart with opposite poles facing each other.
C
Use two magnets, one on the door and one on the door frame, to hold a cabinet door closed.
D
Tape a bar magnet to the top of a toy car and use a second bar magnet to move the car without allowing it to touch the car.
Explanation: 

Detailed explanation-1: -Moving charges create magnetic fields, and this generated field can attract or repel other magnets. The motion of electrons within an atom creates magnetic fields.

Detailed explanation-2: -Although Faraday received little formal education, he was one of the most influential scientists in history. It was by his research on the magnetic field around a conductor carrying a direct current that Faraday established the concept of the electromagnetic field in physics.

Detailed explanation-3: -According to the double revolving field theory of single-phase induction motor, a stationary pulsating magnetic field can be resolved into two rotating magnetic fields. Both the magnetic fields are of equal magnitude but rotating in opposite directions.

Detailed explanation-4: -The magnetic field is the area around a magnet that has magnetic force. All magnets have north and south poles.

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