IIT JEE Advanced & Mains Physics 2018 : Electricity : Rank file / expected questions / Physicsmynd Elite Series / Page V
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37 ] Figure below depicts a practical application of electrostatics ,where an ore is separated into components using an uniform electrical field . Assume that the ore particles are at zero initial velocity and displacement .Calculate the separation between the particles after falling through 49 cm. Here E = 900 kV/m and 
for both positively and negatively charged particles.
38 ] Consider an uniformly charged circular ring of charge 
C/m and radius r . It’s placed on the xy-plane with it’s axis the same as that of the z-axis.Then – find the value of E at (o,o,h ) .
39 ] In the above case,the maximum value of E with relation of h ,ie .the distance from the center of the ring is at –
A ] h = 
B ] h = 
C ] h = 
D ] None of the above
40 ] Regarding above case ,what would happen to E when 
?
41 ] The figure shows a positive point charge Q located at distances d1 and d2, respectively, from two grounded perpendicular conducting half-planes Find the force on Q caused by the charges induced on the planes.
42 – 43] Consider a line charge of charge density 
placed parallel to a conducting cylinder of radius a at a distance d from it . Then find the following –
The electric potential at a distance d from a line charge of density 
[ when the cylinder is absent ]
43 ] In the above case prove that the cylindrical surface is an equipotential ?
44 – 45 ] The figure below shows a grounded coaxial cable .
Find the potential distribution in the space 
45 ] The above result indicates a key theoretical point – what’s it ?
