Learn

Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctMediumApplication

JEE Main 30 July 2022, Shift 2, Physics Q15

Question 15 of 90 in this shift, Physics question 15 of 30, Section A.

A wire of length 8 m is bent to form a circular loop in y-z plane. A current of 0.5 A is flowing in anticlockwise direction in it , the magnetic dipole moment of the loop is:
  1. (1)−8 i^ A m2-8\,\hat{i}\ \mathrm{A\,m^2}
  2. (2)8π i^ A m2\frac{8}{\pi}\,\hat{i}\ \mathrm{A\,m^2}Official answer
  3. (3)−4π i^ A m2-4\pi\,\hat{i}\ \mathrm{A\,m^2}
  4. (4)4π i^ A m24\pi\,\hat{i}\ \mathrm{A\,m^2}

Official answer

Option 2

NTA final key.

Chapter
Moving Charges and Magnetism
Topic
Magnetic Dipole Moment
Idea tested
Magnetic moment of a current loop

Same idea in other shifts

Asked 3× in all
  1. 26 Jul 2022, Shift 2 · Q46Two concentric circular loops of radii r1r_1=30 cm and r2r_2=50 cm are placed in X-Y plane as shown in the figure. A current I=7AI = 7A is…MediumDiagram basedHas a figure
  2. 29 Jul 2022, Shift 1 · Q58A wire of length 314 cm carrying current of 14 A is bent to form a circle. The magnetic moment of the coil is __________ A-m2\mathrm{m^2}.…MediumNumerical value

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.