JEE Main 2020 · PhysicsMultiple choiceSingle correctMediumConceptual

JEE Main 8 January 2020, Shift 2, Physics Q10

Question 10 of 75 in this shift, Physics question 10 of 25, Section A.

Consider two charged metallic spheres

S_1

and

S_2

of radii

R_1

and

R_2

, respectively. The electric fields

E_1

(on

S_1

) and

E_2

(on

S_2

) on their surfaces are such that

E_1/E_2=R_1/R_2

. Then the ratio

V_1

(on

S_1

V_2

(on

S_2

) of the electrostatic potentials on each sphere is :

(1) $R_1/R_2$
(2) $(R_1/R_2)^2$ Official answer
(3) $\left(\frac{R_1}{R_2}\right)^3$
(4) $(R_2/R_1)$

Official answer

Option 2

NTA final key (Jan 2020).

Chapter: Electrostatic Potential and Capacitance
Topic: Electric Potential
Idea tested: Potential of a Spherical Shell

Same idea in other shifts

Asked 4× in all

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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.