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Syllabus

A copper wire of diameter d is immersed in an oil of density rho not. There is a uniform electric field E directed vertically upwards such that the copper ball remains just suspended in the oil. Density of copper is rho c. The charge on the ball is ?

Positive charge Q is distributed uniformly throughout an insulating sphere of radius R, centered

at the origin. A particle with positive charge Q is placed at x = 2R on the x axis. The

magnitude of the electric field at x = R/2 on the x axis is:

A. Q/4πε

_{0}R^{2}B. Q/8πε

_{0}R^{2}C. Q/72πε

_{0}R^{2}D. 17Q/72πe

_{0}R^{2}E. none of these

Consider the situation shown in the figure what are the sign of Q1 and Q2 if the lines are drawn in proportion to the charge what is the ratio of q1/q2?Two identical charged spheres are suspended by strings of equal lengths .The string makes an angle of 30 with each other When suspended in liquid of density 0.8g/cm^3, The angle remains the same.if density of material of sphere is 1.6g/cm^3 the dielectric constant of liquid is?

Two similiarly and equally charged identical metal sphere A and B repel each other with a force of 2*10^{-5}N. A third identical uncharged sphere C is touched with A and then placed at the mid point between A and b . Calculate the net electric force on C.PLEASE DON'T SEND THE LINK.

electric field intensity at a point in between two parallel sheets with like charges of same surface density is??The field outside the sphere at a distance r will be.??

Of charge Q initially on a tiny sphere a portion,a portion q is to be transferred to a second nearby sphere. Both spheres can be treated as particles. For what value of q/Q will the electrostatic force between two spheres be maximum?A cylinder with adiabatic walls contains water. The cylinder is closed on top with a metal cover with area A, thickness b, thermal conductivity K, Heat capacity of water is c, temperature of surroundings is ${T}_{0}$, assumed to be constant. An electric heater produces heat at a rate H. Find the temperature of water as function of time after the heater is switched on

^{2}/8R, M is the mass of protons.a) constant

b) first increases then decreases

c) first decreases then increases

d) decreases continuously

answer is c. please explain

(c) 4 N (repulsive) (d) 12 N (attractive)