A horizontal metal bar rotates at a constant angular velocity w ...

[rmenurse]

A horizontal metal bar rotates at a constant angular velocity w about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The emf induced between the two ends of the bar is
 
  A) constant and proportional to the product B .
  B) constant and proportional to the product B 2.
  C) constant and proportional to the product B2 2.
  D) variable with a maximum of B .
  E) variable with a maximum of B 2.

Question 2

One beam of coherent light travels path P1 in arriving at point Q and another coherent beam travels path P2 in arriving at the same point. If these two beams are to interfere destructively, the path difference P1 - P2 must be equal to
 
  A) an odd number of half-wavelengths.
  B) a whole number of wavelengths.
  C) zero.
  D) a whole number of half-wavelengths.

[essyface1]

Answer to Question 1

A

Answer to Question 2

A

[rmenurse]

Both answers were spot on, thank you once again

[essyface1]

Great! Please up vote