The coil of a generator has 50 loops and a cross-sectional area of 0.25 m2. What is the maximum emf ...

The coil of a generator has 50 loops and a cross-sectional area of 0.25 m2. What is the maximum emf generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?
 
  A) 100. V
  B) 50. V
  C) 400. V
  D) 75. V
  E) 0. V

Question 2

Which is the most common type of spacecraft propulsion used today?
 
  A) solar sails
  B) nuclear rockets
  C) ion engines
  D) chemical rockets

Question 3

A planet speeds up in its orbit as it gets closer to the sun because of
 
  A) the torque exerted on the planet by the sun.
  B) conservation of energy.
  C) conservation of momentum.
  D) conservation of angular momentum.
  E) inertia.

Question 4

Which terrestrial planet(s) have magnetic fields?
 
  A) Earth and Venus
  B) Earth only
  C) all of them do
  D) Earth and Mercury