Question

Find the value of unknown resistance ‘X’ when no current flows through the galvanometer. (1)



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Answer 1

Explanation:

Applying K-Law is classed loop AFEBA.

9−I×1−I×1−4×0−6=0

⇒9−21−6=0

⇒3=2I

In loop BEDCB

6+4×0−IR−3=0

⇒IR=3

⇒R=3I=33×2⇒R=2Ω.

PD between A and D.