# IIT JEE Advanced & Mains Physics 2018 : Electricity : Rankfile / expected questions : V

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 ?