AskQ logo

STUCK ON HOMEWORK?

ASK FOR HELP FROM OUR KIASUPARENTS.COM COMMUNITY!

Question

Answer

If only 4 bulbs, it looks to me that there is a short circuit in the red loop from battery to B to C and no bulb will light up.

Might be question in error or 5th bulb got “blanko” by mistake (likely the latter)

For interest and discussion, if 5th bulb is where I marked so there will not be any short circuit, answer is B*.

open A: 3 bulbs lighted up

open B: 2 bulbs lighted up *

open C: 4 bulbs lighted up

open D: 3 bulbs lighted up

 

0 Replies 0 Likes ✔Accepted Answer

When both B & C are closed, there is a short in the battery and so none will light up and so there is probably an error in the question.

0 Replies 0 Likes

Where is the 5th bulb?

With this current setup, opening either A, B or D will result in 2 bulbs lighted, so none of the choices is correct. 

0 Replies 0 Likes