When a 100- resistor is connected to a battery of emf E and ...

[joblessjake]

When a 100- resistor is connected to a battery of emf E and internal resistance r, the battery delivers a power P = 0.794 W. When a 200  resistance is connected to same battery it delivers a power P = 0.401 W.
 
  What are the emf and internal resistance of the battery? A)
 
  E = 10 V, r = 5  
  B)
 
  E = 4.5 V, r = 4  
  C)
 
  E = 18 V, r = 4  
  D)
 
  E = 9 V, r = 2  
  E)
 
  E = 12 V, r = 6

Question 2

A changing magnetic field can produce an electric current.
 
  Indicate whether the statement is true or false

[kmb352]

Answer to Question 1

D

Answer to Question 2

TRUE