Chapter 15 - Electromagnetism

Electromagnetism

Quiz

 

1. • The phenomenon of inducing an electromotive force (EMF) in a coil due to a changing magnetic field is known as:
   1.   . Electromagnetic induction
   2.   . Magnetic flux
   3.   . Magnetic resonance
   4.   . Electrolysis
2. The direction of the induced current is given by:
   1.   Ampere's Law
   2.   . Lenz's Law
   3.   . Ohm's Law
   4.   Faraday's Law
3. • In a simple electric motor, the interaction between the current in the coil and the magnetic field results in:
   1.   A force that produces rotational motion
   2.   An increase in electric potential
   3.   . A reduction in the resistance of the coil
   4.   . A change in the direction of the current
4. The strength of an electromagnet can be increased by:
   1.   . Increasing the current through the coil
   2.   . Decreasing the number of turns in the coil
   3.   . Using a weaker core material
   4.   . Reducing the current through the coil
5. The magnetic field around a current-carrying wire forms:
   1.   A straight line
   2.   . A loop
   3.   . A concentric circle
   4.   . A helix
6. • The unit of magnetic flux is:
   1.   . Tesla
   2.   . Weber
   3.   . Ampere
   4.   . Coulomb
7. • The SI unit of magnetic field strength is:
   1.   . Newton per Coulomb (N/C)
   2.   Tesla (T)
   3.   . Volt per meter (V/m)
   4.   . Ohm (Ω)
8. • The right-hand rule helps to determine:
   1.   . The direction of the magnetic field around a current-carrying wire
   2.   The direction of the induced current
   3.   The magnitude of the EMF
   4.   . The resistance of the coil
9. • An alternating current (AC) in a coil induces a:
   1.   . Constant magnetic field
   2.   . Uniform magnetic field
   3.   . Varying magnetic field
   4.   Zero magnetic field
10. • The phenomenon of a magnetic field being produced around a wire carrying current is called:
    1.   . Magnetic induction
    2.   . Magnetic resonance
    3.   Electromagnetic induction
    4.   . Electromagnetic effect