QUIZ 2 (TOPIC 4,5,6)

1.Magnetic field can be related as

• an area around a magnet where a magnetic force can be experienced.
• number of electric field lines passing perpendicularly through the unit area.
• rate of magnetic flow.
• a North pole.

2.If the South pole of a bar magnet is brought near the North pole of another bar magnet, the force between the two bar magnets is

• attractive.
• repulsive.
• no force.
• attractive then repulsive.

3. An alpha particle enters a region of uniform magnetic field perpendicularly will be

• moving straight without getting deflected
• moving in a parabolic path.
• moving in a circular path.
• moving in a helical path.

4.If electric current in a conductor flows in a direction parallel to the magnetic field, the magnetic force acts on the conductor will be

• maximum
• negative
• zero
• infinity

5.There is a force of attraction between two current-carrying conductors when the currents in the conductors flow

• in opposite directions
• in same direction
• of different magnitude
• of the same magnitude

6. If a moving electron experiences the same magnitude of magnetic force and electric force but in the opposite direction, it will be

• moving in circular path
• moving in a straight line
• unaffected
• moving in parabolic path

7.Which of the following statements is NOT TRUE about magnetic flux?

• It is independent of surface area.
• It is the product of the normal component of the surface area with the magnetic flux density.
• It is zero if the magnetic field is parallel to the surface area.
• It represents the total magnetic field lines passing through a surface area.

8.Faraday’s Law states that the e.m.f induced in a loop of wire is proportional to

• the change of magnetic flux through the loop
• the rate of change of magnetic flux through the loop.
• the magnetic field multiplied by the time.
• current divided by time.

9.Which of the following laws is used to find the direction of the induced current in a loop of wire placed in a changing magnetic field?

• Lenz’s Law.
• Faraday’s Law.
• Ampere’s Law.
• Coulomb’s Law.

10.When a loop of wire is rotated in a uniform magnet field, the induced emf will be generated. Which of the following DOES NOT influence the induced emf?

• the cross sectional area of the loop.
• the magnetic field.
• the rotating speed of the loop.
• the length of wire.