HARD
JEE Advanced
IMPORTANT
Earn 100
An oil drop, carrying six electronic charges and having a mass of , falls with some terminal velocity in a medium. What magnitude of the vertical electric field is required to make the drop move upward with the same speed as it was formerly moving downward? Ignore buoyancy.
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Important Questions on Coulomb's Law and Electric Field
MEDIUM
JEE Advanced
IMPORTANT
Five points charges, each is placed at the five vertices of a regular hexagon. The distance of the centre of the hexagon from any of the vertices is . The electric field at the centre of the hexagon is
MEDIUM
JEE Advanced
IMPORTANT
A ring of charge with radius has gap. If the ring carries a charge of , the electric field at the centre is
HARD
JEE Advanced
IMPORTANT
Three positive charges of equal magnitude are placed at the vertices of an equilateral triangle of side . How can the system of charges be placed in equilibrium?
MEDIUM
JEE Advanced
IMPORTANT
Three identical spheres, each having a charge and radius , are kept in such a way that each touches the other two. The magnitude of the electric force on any sphere due to the other two is
MEDIUM
JEE Advanced
IMPORTANT
Five point charges, each of value , are placed on five vertices of a regular hexagon of side . The magnitude of the force on a point charge of value coulomb placed at the center of the hexagon is
HARD
JEE Advanced
IMPORTANT
It is required to hold equal charges in equilibrium at the corners of a square. What charge when placed at the centre of the square will do this?
MEDIUM
JEE Advanced
IMPORTANT
A point charge is located at the origin. The electric field (in ) vector at the point , as shown in figure, is
HARD
JEE Advanced
IMPORTANT
A positive point charge is located in the place plane at a point with radius vector . The electric field vector at a point with radius vector , where and are expressed in metre, is
