Consider a solenoid of length L, N windings, and radius b (L is ...

[123654777]

Consider a solenoid of length L, N windings, and radius b (L is much longer than b). A current I is flowing through the wire.
 
  If the radius of the solenoid were doubled (becoming 2b), and all other quantities remained the same, the magnetic field inside the solenoid would
  A) remain the same.
  B) become twice as strong.
  C) become one half as strong.

Question 2

Two very long parallel wires in the xy-plane, a distance 2a apart, are parallel to the y-axis and carry equal currents I as shown in the figure.
 
  The +z direction points perpendicular to the xy-plane in a right-handed coordinate system. If both currents flow in the +y direction, which one of the graphs shown in the figure below best represents the z component of the net magnetic field, in the xy-plane, as a function of x? (Caution: These graphs are not magnetic field lines.)
 
  A) 1
  B) 2
  C) 3
  D) 4
  E) 5

[katieost]

Answer to Question 1

Answer: A

Answer to Question 2

Answer: C

[123654777]

Both answers were spot on, thank you once again

[katieost]

Great! Please up vote