A. increase the current by 0.4A
B. reduce the current by 0.4A
C. increase the current by 0.6A
D. reduce the current by 0.6A

Correct Answer:

Option A = increase the current by 0.4A

Explanation

When K is open. Total Resistance = 8 + 2 = 10Ω
1 = VΩ = 6vΩ = 0.6A

Where K is closed, 18+18=1Ω

28=1Ω
Ω = 82 = 4Ω
Ω = 82 = 4Ω
4Ω in series with 2Ω= 6Ω
1 = VΩ = 66 = 1A

1 – 0.6A = 0.4A increase

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