Consider the following scenarios separately, i.e., only one wire is cut at a tim

Question

Consider the following scenarios separately, i.e., only one wire is cut at a time.
What would happen after cutting the wire at A?
a)Bulb E becomes brighter.
b) Bulb E becomes dimmer, but does not go off.
c) All bulbs become brighter.
d) Nothing happens.
e) All bulbs become dimmer.
f) Bulb C goes off.

What would happen after cutting the wire at B?
a) Nothing happens.
b) Bulb C goes off.
c) All bulbs become dimmer.
d) Bulb E becomes dimmer, but does not go off.
e) Bulb E becomes brighter.
f) All bulbs become brighter.

What would happen after cutting the wire at D?
a) All bulbs become dimmer.
b) Bulb E goes off.
c) All bulbs become brighter.
d) Bulb C becomes brighter.
e) Bulb C becomes dimmer, but does not go off.
f) Nothing happens.

What would happen after cutting the wire at G?
a) Bulb C becomes dimmer, but does not go off.
b) Bulb E goes off.
c) Bulb C becomes brighter.
d) All bulbs become brighter.
e) All bulbs become dimmer.
f) Nothing happens.

Consider the circuit above, which has three light bulbs (labelled C, E, and F), a battery, and wires. Assume that the light bulbs behave like ohmic resistors, and that they are brighter the more current is passing through them. Ignore that all bulbs are drawn equally bright in the diagram. Which one of the following is true if no wires are cut? a) All bulbs are equally bright. b) Bulbs C and E are off. c) Bulb F is off. d) Bulbs F and E are off. e) Bulb F is dimmer than the other two, but not off. Consider the following scenarios separately, i.e., only one wire is cut at a time. What would happen after cutting the wire at A? a)Bulb E becomes brighter. b) Bulb E becomes dimmer, but does not go off. c) All bulbs become brighter. d) Nothing happens. e) All bulbs become dimmer. f) Bulb C goes off. What would happen after cutting the wire at B? a) Nothing happens. b) Bulb C goes off. c) All bulbs become dimmer. d) Bulb E becomes dimmer, but does not go off. e) Bulb E becomes brighter. f) All bulbs become brighter. What would happen after cutting the wire at D? a) All bulbs become dimmer. b) Bulb E goes off. c) All bulbs become brighter. d) Bulb C becomes brighter. e) Bulb C becomes dimmer, but does not go off. f) Nothing happens. What would happen after cutting the wire at G? a) Bulb C becomes dimmer, but does not go off. b) Bulb E goes off. c) Bulb C becomes brighter. d) All bulbs become brighter. e) All bulbs become dimmer. f) Nothing happens.

Explanation / Answer

1. OPTION C. Bulb F is off.

2. OPTION B. Bulb E becomes dimmer, but does not go off.

[Bulb C is now part of the system, and takes its share, so C and E becomes dimmer.]

3. OPTION A. Bulb C goes off.

[Actually, all bulbs go off as they are no longer connected to the battery.]

4. OPTION B. Bulb E goes off.

[Actually, all bulbs go off as they are no longer connected to the battery.]

5. OPTION F. Nothing happens.

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