JEE Main 2020 · PhysicsNumerical answerNumerical valueEasyCalculation

JEE Main 3 September 2020, Shift 2, Physics Q24

Question 24 of 75 in this shift, Physics question 24 of 25.

A galvanometer coil has 500 turns and each turn has an average area of

3 \times 10^{-4}

^2

. If a torque of 1.5 Nm is required to keep this coil parallel to a magnetic field when a current of 0.5 A is flowing through it, the strength of the field (in T) is ________.

Official answer

20.00

NTA final key (Sep 2020).

Chapter: Moving Charges and Magnetism
Topic: Magnetic Dipole Moment
Idea tested: Torque on a dipole in uniform field

Same idea in other shifts

Asked 6× in all

4 Apr 2026, Shift 2 · Q49A circular coil of radius 2 cm and 125 turns carries a current of 1 A. The coil is placed in a uniform magnetic field of magnitude 0.4 T.…EasyNumerical value
8 Apr 2026, Shift 2 · Q39A current carrying circular loop of radius 2 cm with unit normal $\hat{n} = \frac{\hat{k} + \hat{i}}{\sqrt{2}}$ is placed in a magnetic…MediumSingle correct
31 Jan 2024, Shift 2 · Q42A uniform magnetic field of $2\times10^{-3}$ T acts along positive $Y$ -direction. A rectangular loop of sides 20 cm and 10 cm with current…MediumSingle correct
26 Aug 2021, Shift 2 · Q29A coil in the shape of an equilateral triangle of side 10 cm lies in a vertical plane between the pole pieces of permanent magnet…MediumNumerical value
5 Sep 2020, Shift 1 · Q15A square loop of side 2a, and carrying current I, is kept in XZ plane with its centre at origin. A long wire carrying the same current I…HardSingle correct

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.