GENERAL PHYSICS 2

What causes a magnetic field around a permanent magnet?

•    Flow of electric field

• Alignment of magnetic domains

•    Heat generation

• Gravitational force

  
  

    A bar magnet is divided into two. Which of the following statement is true?

• The bar magnet is demagnetized

• The magnetic field of each separated piece becomes stronger.

•     The magnet poles are separated.

• Two new bars magnets are created.

If a magnet is pushed into a coil, voltage is induced across the coil. What will happen if the same magnet is pushed into a coil with twice the number of loops?

• the same voltage is induced

•  twice as much voltage is induced

•  one half as much voltage is induced

• four times as much voltage is induced

  Which of the following factors does not affect the magnitude of the induced voltage in a coil?

• The strength of the magnetic field.

• The speed at which the magnetic field changes.

•   The orientation of the coil relative to the magnetic field

•   The temperature of the coil

   

    Which of the following factors affects the magnetic flux through a surface?

•    The surface area

•     The angle between the magnetic field and the surface

• The magnetic field strength

•   All of the above

The magnetic flux through a closed surface is zero when

• The magnetic field is zero.

• The surface is perpendicular to the magnetic field.

•   The surface is 30^o to the magnetic field.

• The surface area is very small.

What happens to light when it reflects off a smooth and polished surface?

•    It scatters in all directions.

•    It is absorbed by the surface.

•    It undergoes refraction.

• It follows the law of reflection

According to the law of reflection, the angle of incidence is:

•     Always greater than the angle of reflection

• Always smaller than the angle of reflection

• Always equal to the angle of reflection

•   Cannot be determined

  Which principle explains why the apparent depth of a pool is less than its real depth?

• Reflection

• Refraction

•     Dispersion

• Diffraction

  Which of the following statements about the speed of light during refraction is true?

• The speed of light increases when it enters a denser medium.

•   The speed of light decreases when it enters a less dense medium.

• The speed of light remains constant regardless of the medium.

• The speed of light is not affected by refraction