JEE Main 2020PhysicsMagnetic Effects of CurrentMediumMCQ

JEE Main 2020 — Magnetic Effects of Current Question with Solution

JEE Main 2020 (08 Jan Shift 2)

Question

A very long wire ABDMNDC is shown in figure carrying current I. AB and BC parts are straight, long and at right angle. At D wire forms a circular turn DMND of radius R. AB, BC parts are tangential to circular turn at N and D. Magnetic filed at the center of circle is:

Choose an option

Show full solutionCorrect option: A
Correct answer
Aμ0I2πRπ+12

Step-by-step explanation


B0→=B0→1+B0→2+B0→3+B0→4
μ0i4πRsin⁡90°-sin45°⨂+μ0i2R⨀+ μ0i4πR(sin45°+sin90°)⨀
-μ0i4πR1-12+μ0i2R+μ0i4πR12+1⨀
=μ0i4πR-1+12+2π+12+1⨀=μ0i4πR2+2π⨀=μ0i2πR12+π⨀

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About this question

This is a previous-year question from JEE Main 2020, covering the Magnetic Effects of Current chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.