Question

2.   A series circuit contains two devices, one with a resistance of 10 ohms and one with a resistance of 4 ohms. If the generator supplies a voltage of 42 V, what is the magnitude of the current?
    
  A. 3 A
  B. 1.75 A
  C. 2 A
  D. 1.33 A
3. When all parts of a circuit are composed of conducting materials, the circuit is said to be
    
  A. parallel.
  B. closed.
  C. open.
  D. shorted
4. Suppose you have two magnets. Magnet A doesn't have its poles labeled, but Magnet B does have a clearly labeled north and south pole. If these two are brought into contact with one another, which of the following could you expect?
    
  A. The side of Magnet A that's repelled by Magnet B's north pole must be Magnet A's south pole.
  B. The side of Magnet A that's attracted to Magnet B's south pole must be Magnet A's north pole.
  C. The side of Magnet A that's repelled by Magnet B's south pole must be Magnet A's north pole.
  D. The side of Magnet A that's attracted to Magnet B's north pole must be Magnet A's north pole

Answer 1

2. In series, we add the resistance up
Use the formula V = IR to find the current.
R = 10+4 = 14, V=42
42=I (14)
I = 42/14 = 3 A

3. Closed

4. Answer B
This is because unlike poles attract and like poles repel.

Hope it helped!

Answer 2

answer is 1.75a for the question