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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceDiagram basedEasyDiagram reading

JEE Main 22 July 2021, Shift 2, Physics Q4

Question 4 of 90 in this shift, Physics question 4 of 30, Section A.

In a circuit consisting of a capacitance and a generator with alternating emf Eg=Eg0sin⁡ωtE_g = E_{g_0}\sin\omega t, VCV_C and ICI_C are the voltage and current. Correct phasor diagram for such circuit is :

The figure, in words

Rectangular circuit: an AC generator labelled E_g (circle with ~) on the left side, a capacitor labelled C on the right side; a curved arrow labelled I_C inside the loop; a double-headed arrow along the capacitor labelled V_C.
  1. (1)[figure: phasor diagram on horizontal and vertical axes; VCV_C drawn up-right at angle ωt\omega t from the horizontal axis, ICI_C drawn down-right; a right-angle mark between VCV_C and ICI_C]
  2. (2)[figure: phasor diagram on horizontal and vertical axes; VCV_C and ICI_C drawn along the same line, both pointing up-right at angle ωt\omega t from the horizontal axis]
  3. (3)[figure: phasor diagram on horizontal and vertical axes; VCV_C drawn up-right at angle ωt\omega t from the horizontal axis, ICI_C drawn up-left; a right-angle mark between VCV_C and ICI_C]Official answer
  4. (4)[figure: phasor diagram on horizontal and vertical axes; VCV_C drawn up-right at angle ωt\omega t from the horizontal axis, ICI_C drawn along the same line in the opposite direction (down-left)]

Official answer

Option 3

NTA final key.

Chapter
Alternating Current
Topic
Phasor Diagrams
Idea tested
Phase Relations in RLC

Same idea in other shifts

Asked 8× in all
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  3. 6 Apr 2023, Shift 2 · Q47A capacitor of capacitance 150.0 μ\muF is connected to an alternating source of emf given by E=36sin⁡(120πt)E=36\sin(120\pi t) V. The maximum value of…EasySingle correct
  4. 13 Apr 2023, Shift 2 · Q44Given below are two statements: Statement I : An AC circuit undergoes electrical resonance if it contains either a capacitor or an…MediumTwo statements
  5. 28 Jul 2022, Shift 1 · Q44The equation of current in a purely inductive circuit is 5sin⁡(49πt−30∘)5\sin(49\pi t-30^\circ). If the inductance is 30 mH then the equation for the…MediumSingle correct
  6. 17 Mar 2021, Shift 2 · Q7Match List - I with List - II List - I List - II (a) Phase difference between current and voltage in a purely resistive AC circuit (i)…EasyMatch the list
  7. 9 Jan 2020, Shift 2 · Q15In LC circuit the inductance L=40L = 40 mH and capacitance C=100 μC = 100\ \muF. If a voltage V(t)=10sin⁡(314 t)V(t) = 10\sin(314\,t) is applied to the circuit,…MediumSingle 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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.