Let E be electric field in air
Tsinθ=qE
Tcosθ=mg
tanθ=mgqE
Q=[C1+C2C1C2][V1+V2]
E=AI¨μoQ=[C1+C2C1C2]AI¨μo[V1+V2]
C1=d−tI¨μ0A⇒E=(C1+C2)(d−t)C2[V1+V2]
Now θ=tan−1[mgq⋅E]
θ=tan−1[mgq×(C1+C2)(d−t)C2(V1+V2)]
JEE Main 2021 — Physics Electromagnetism
2021mcqhard
A simple pendulum of mass ' m ', length ' l ' and charge ′+q′ suspended in the electric field produced by two conducting parallel plates as shown. The value of deflection of pendulum in equilibrium position will be
Official previous-year question
Held on 27 Jul 2021 · Verified 6 Jul 2026.
Options
- A
tan−1[mgq×(C1+C2)(d−t)C1(V2−V1)]
- B
tan−1[mgq×(C1+C2)(d−t)C2(V2−V1)]
- C
tan−1[mgq×(C1+C2)(d−t)C2(V1+V2)]
- D
tan−1[mgq×(C1+C2)(d−t)C1(V1+V2)]
Did you get this right?
Sign in to track your attempts and accuracy.
Your note
Sign in to keep a private note on this question. Nothing you write is ever public.
JEE Main Electromagnetism in other years
More JEE Main Electromagnetism questions
A short bar magnet placed with its axis at $30^{\circ}$ with an external field of 800 Gauss, experiences a torque of $0.016 \mathrm{~N}. \mathrm{m}$. The work done in moving it from most stable to most unstable position is $\alpha \times 10^{-3} \mathrm{~J}$. The value of $\alpha$ is $\_\_\_\_$.
2026medium
A small cube of side $1$ mm is placed at the centre of a circular loop of radius $10$ cm carrying a current of $2$ A. The magnetic energy stored inside the cube is $\alpha \times 10^{-14}$ J. The value of $\alpha$ is _______. ($\mu_o = 4\pi \times 10^{-7}$ Tm/A, $\pi = 3.14$)
2026medium
A 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. The axis of the coil makes an angle of $30°$ with the direction of the magnetic field. The torque acting on the coil is $\alpha \times 10^{-4}$ N.m. The value of $\alpha$ is ______. ($\pi=3.14$)
2026medium
$1\,\mu$C charge moving with velocity $\vec{v} = \left(\hat{i} - 2\hat{j} + 3\hat{k}\right)$ m/s in the region of magnetic field $\vec{B} = \left(2\hat{i} + 3\hat{j} - 5\hat{k}\right)$ T. The magnitude of force acting on it is $\sqrt{\alpha} \times 10^{-6}$ N. The value of $\alpha$ is _______.
2026medium
A series LCR circuit with $R = 20\ \Omega$, $L = 1.6\text{ H}$ and $C = 40\ \mu\text{F}$ is connected to a variable frequency a.c. source. The inductive reactance at resonant frequency is _______ $\Omega$.
2026medium
Other Physics topics for JEE Main
Keep practicing Electromagnetism
Work through every JEE Main Electromagnetism PYQ, year by year.