how does the circuit change when the wire is added?\na closed circuit occurs and makes all bulbs turn…

how does the circuit change when the wire is added?\na closed circuit occurs and makes all bulbs turn off.\nan open circuit occurs and makes all bulbs turn off.\na short circuit occurs and makes bulbs 3 and 4 turn off but keeps bulbs 1 and 2 lit.\na short circuit occurs and makes bulbs 1 and 2 turn off but keeps bulbs 3 and 4 lit.

how does the circuit change when the wire is added?\na closed circuit occurs and makes all bulbs turn off.\nan open circuit occurs and makes all bulbs turn off.\na short circuit occurs and makes bulbs 3 and 4 turn off but keeps bulbs 1 and 2 lit.\na short circuit occurs and makes bulbs 1 and 2 turn off but keeps bulbs 3 and 4 lit.

Answer

Explanation:

Step1: Analyze circuit after wire addition

When the wire is added between points X and Y, a path of zero - resistance is created bypassing bulbs 3 and 4. This is a short - circuit for bulbs 3 and 4.

Step2: Determine bulb states

Since the current will take the path of least resistance (the added wire), no current will flow through bulbs 3 and 4, so they turn off. Bulbs 1 and 2 are still part of a working circuit and remain lit.

Answer:

A short circuit occurs and makes bulbs 3 and 4 turn off but keeps bulbs 1 and 2 lit.