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Saturday, 31 October

JEE Main 2020 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 5 September 2020, Shift 1, Physics Q23

Question 23 of 75 in this shift, Physics question 23 of 25.

Two concentric circular coils, C1C_1 and C2C_2, are placed in the XY plane. C1C_1 has 500 turns, and a radius of 1 cm. C2C_2 has 200 turns and radius of 20 cm. C2C_2 carries a time dependent current I(t)=(5t2−2t+3)I(t) = (5t^2 - 2t + 3)A where t is in s. The emf induced in C1C_1 (in mV), at the instant t = 1 s is 4x\frac{4}{x}. The value of xx is __________.

Official answer

5.00

NTA final key (Sep 2020).

Chapter
Electromagnetic Induction
Topic
Inductance
Idea tested
Mutual Inductance of Coaxial Coils

Same idea in other shifts

Asked 2× in all
  1. 6 Apr 2023, Shift 2 · Q54Two concentric circular coils with radii 1 cm and 1000 cm, and number of turns 10 and 200 respectively are placed coaxially with centers…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.