# IIT JEE Advanced & Mains Physics 2020 -2021 ,2022 : Electricity : Rank file / expected questions : III

IIT JEE Advanced & Mains Physics 2018 : Electricity : Rank file / expected questions / Physicsmynd Elite Series  /  Page  III

Primary Users : Students appearing for the Advanced and Mains Exam for Admission to the BTech Courses at the Indian Institutes of Technology , National Institutes of Technology , Indian Institute of Space science and Technology and other National Engineering Institutes, INDIA .

Secondary Users : GATE Physics  , JAM Physics , Physics paper of Civil Services Exam , UGC – NET Physics , National and International Physics Olympiads,International College level Physics Exams, Indian State Board Engineering entrance exams etc.

Tertiary Users : All those who love Physics !

READY FOR JEE ADVANCED PHYSICS 2020 -2021 ? TRY OUR ONLINE EXAMS….

[ Answers with full explanations and tips & tricks to solve similar problems to be published in our site https://schoolmynd.com ]

Page  : 3

19]  A cone [ of resistivity  ] is cut off at a height of h from it’s base.If it’s uniformly charged throughout it’s  cross-sections, then the resistance between the two end of the cut – off cone is –

A ]

B ]

C ]

D]

20 ] A charge distribution produces an electric field   where c is a constant. Then the total charge in the distribution is –

A ]

B ]

C ]

D ]

21 ] Figure below shows the path of an electron where A B – when not under the influence of a field and B’ , C’ and D’ ,under the influence of three different electric fields 1 , 2 ,and 3 respectively . . Then the Drift Velocity of the electron under the second field is indicated by –

A ] AB + AB’

B ] ABB’

D ] BC’

22 ] Earnshaw’s law states that a collection of point charges cannot be maintained in a stable stationary equilibrium configuration solely by the electrostatic interaction of the charges .Give a simple non-mathematical proof for the same .

23 ] Two conductors are embedded in a material of conductivity  and dielectric constant . The resistance between the two conductors is found to be . Find the magnitude of the capacitance between the two conductors .

24] Figure below shows an hypothetical infinite conducting plane in the ( x,y,z) plane having charges Q1 , Q2 , Q3 , Q4  located in cavities.What can we predict with certainty regarding the nth cavity containing charge Qn ?

A ] V experienced by Q1 will influence the V of Qn

B ] V  of Q1  = V of Qn

C ] The whole conducting surface up to that containing Qn is an equipotential .

D ] V of the conducting plane cannot be zero .

READY FOR JEE ADVANCED PHYSICS 2020 -2021 ? TRY OUR ONLINE EXAMS….

25 ] Parallel to ( x ) and at a distance d .above a grounded conducting plane ( xy ) is placed an infinite wire of uniform charge   Then the  potential in the region above the plane is –

A ] V   =

B ] V   =

C ] V   =

D ] V   =

26 ]  In the above case,the charge density   induced on the conducting plane is –

A }

B ]

C ]

D ]

27 ] Diagram below represents a hollow conductor on which a test potential of around 90,000 V is applied.Choose the graph which correctly represents the incidence of potential inside the cavity . The x axis denotes the time elapsed in pico -seconds .

READY FOR JEE ADVANCED PHYSICS 2020 -2021 ? TRY OUR ONLINE EXAMS….