MOCK UPS 3_1

1. The sources of the magnetic field are _____________.

• magnet and conductor.
• bar magnet and insulator.
• bar magnet and conductor carrying current.
• bar magnet and conductor.

2. What happens to the strength of a magnetic field as you move away from the magnet?

• The strength of the magnetic field increases.
• The strength of the magnetic field doesn’t change.
• The strength of the magnetic field is doubled.
• The strength of the magnetic field decreases.

3. What does the following represent?

• Uniform magnetic field directed out of page.
• Uniform magnetic field directed into the page.
• Uniform magnetic field directed upward of page.
• Uniform magnetic field directed inward of page.

4. Are the magnetic field lines in the picture correct?

• Yes, because they point from north to south.
• Yes, because they point from south to north.
• Yes, because the north pole is always in left side.
• Yes, because the north pole is always in right side.

5. What would happen if you touched a south pole end of a magnet to a north pole end of another magnet?

• they would be attracted to each other
• they would be repelled from each other
• they would be changed from each other
• they would be pushed from each other

6. An electric current flows anticlockwise. What is the direction of the magnetic field on the coil?

• Into of the page.
• Out of the page.
• Clockwise.
• Counter-clockwise.

7. Electromagnetic induction occurs when ____________.

• an emf is induced in a magnetic flux coil.
• there is a change in magnetic flux.
• a current is induced in the coil.
• there is a magnetic flux in the coil.

8. An emf will be induced in a straight conductor if ______________.

• the conductor is stationary across a constant magnetic flux
• the conductor cuts across a constant magnetic flux
• a constant magnetic flux is placed parallel to the conductor
• the conductor moves parallel to a constant magnetic flux

9. Faraday’s Law state that induced emf is proportionally to the rate of change of ____________.

• magnetic field
• electric field
• magnetic flux
• electric flux

1. An image that is formed at the back of the mirror is said to be …...

• real image
• virtual image
• inverted image
• positive image