JEE Main 2022 · PhysicsNumerical answerNumerical valueMediumMulti-step

JEE Main 26 July 2022, Shift 2, Physics Q59

Question 59 of 90 in this shift, Physics question 29 of 30, Section B.

A potentiometer wire of length 300 cm is connected in series with a resistance 780

\Omega

and a standard cell of emf 4V. A constant current flows through potentiometer wire. The length of the null point for cell of emf 20 mV is found to be 60 cm. The resistance of the potentiometer wire is ___________

\Omega

Official answer

NTA final key.

Chapter: Current Electricity
Topic: Potentiometer
Idea tested: Potential Gradient Calculation

Same idea in other shifts

Asked 5× in all

28 Jul 2022, Shift 1 · Q55As shown in the figure, a potentiometer wire of resistance 20 $\Omega$ and length 300 cm is connected with resistance box (R.B.) and a…HardNumerical valueHas a figure
24 Jun 2022, Shift 2 · Q53A potentiometer wire of length 10 m and resistance 20 $\Omega$ is connected in series with a 25 V battery and an external resistance 30…MediumNumerical value
8 Jan 2020, Shift 1 · Q20The length of a potentiometer wire is 1200 cm and it carries a current of 60 mA. For a cell of emf 5 V and internal resistance of 20…MediumSingle correct
2 Sep 2020, Shift 2 · Q20A potentiometer wire PQ of 1 m length is connected to a standard cell E $_1$ . Another cell E $_2$ of emf 1.02 V is connected with a…EasyDiagram basedHas a figure

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.