A solenoid of length 5.0 cm has a cross sectional area of 1.0 cm2 ...

[cnetterville]

A solenoid of length 5.0 cm has a cross sectional area of 1.0 cm2 and has 300 uniformly spaced turns. The solenoid is wrapped in 180 turns of insulated wire resulting in a mutual inductance of
 
  A)
 
  1.1 H.
  B)
 
  1.4  10-2 H.
  C)
 
  11 H.
  D)
 
  1.4  10-4 H.
  E)
 
  110 H.

Question 2

The monthly (30 days) electric bill included the cost of running a central air-conditioning unit for 2.0 hr/day at 5000 W, and a series connection of ten 60 W light bulbs for 5.0 hr/day.
 
  How much did these items contribute to the cost of the monthly electric bill if electricity costs 8.0 per kWh? A)
 
  21.30
  B)
 
  39.50
  C)
 
  31.20
  D)
 
  13.20
  E)
 
  12.30

[blazinlyss]

Answer to Question 1

D

Answer to Question 2

C

[cnetterville]

Gracias!

[parshano]

Excellent