Gce Model Questions Vol1 2021 Physics Question 8
Practice objective / multiple choice question 8 from the 2021 Gce Model Questions Vol1 Physics examination.
A Wheatstone bridge is powered by a 10 V dc source. The four arms have resistances \(R_1=20\ \Omega\), \(R_3=30\ \Omega\) and \(R_4=40\ \Omega\). The galvanometer connecting the two junctions has resistance \(R_g=5\ \Omega\).\n(a) Find the value of \(R_2\) that balances the bridge (zero galvanometer current).\n(b) If the actual \(R_2\) is 25 \(\Omega\), calculate the current through the galvanometer. Give the current in milliamperes to two significant figures.
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About This Question
This is Gce Model Questions Vol1 2021 Physics Question 8. It is one of the objective questions from the 2021 Gce Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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