Questions
In the circuit shown in figure, XY is a potentiometer wire 100 cm long. The circuit is connected as shown. With switches S2 and S3 open, a balance point is found at Z. After switch ,S1 has remained closed for some time, it is found that contact at Z must be moved towards Y to maintain a balance. Which of the following is most likely reason for this?
detailed solution
Correct option is A
(a) If V1 decreases, then potential difference across XZ will decrease. So to have same potential difference i.e., V2 across XZ, length XZ has to be increased or Z should be moved towards Y.(b) is incorrect because for this z should have been moved towards r.(c) will be incorrect because xz can get warm if current through it increases which is not possible.(d) is incorrect because there is no current through R1.Talk to our academic expert!
Similar Questions
A cell of resistance and emf 10 volt is connected to a uniform wire of length 500 cm and resistance 3 ohm. The potential gradient in the wire is
799 666 8865
support@infinitylearn.com
6th Floor, NCC Building, Durgamma Cheruvu Road, Vittal Rao Nagar, HITEC City, Hyderabad, Telangana 500081.
JEE Mock Tests
JEE study guide
JEE Revision Notes
JEE Important Questions
JEE Sample Papers
JEE Previous Year's Papers
NEET previous year’s papers
NEET important questions
NEET sample papers
NEET revision notes
NEET study guide
NEET mock tests