Three pith balls supported by insulating threads hang from a support. We know th

Question

Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near the balls Y and Z without touching them, it attracts Y and repels Z. Since pith is a insulating material, we can conclude that Y has a negative charge Z has a negative charge Y has a positive charge Z is neutral( has no net charge.) Y is negatively charged or neutral ( has no net charge.) Two imaginary spherical surface of radius R and 2R respectively around a positive point charge Q located at the center of the concentric sphere. When compared to the number of field lines N_1 going through the sphere of radius R_1, the number of electric field lines N_2 going through the sphere of radius 2R is N_2= 1/4 N_1 N_2= 1/2 N_1 N_2 =N_1 N_2= 2N_1 N_2=4N_1 Three 2.50 meu Cs charges are placed on tiny conducting spheres at the ends of 1.00 meter long strings that are connected ar 120 degree angles as shown below. The magnitude, in N, of the force on the knot at the center is (see Fig.2) 0 3.75*10^-2 5.63*10^-2 6.50*10^-2 7.50*10^-2

Explanation / Answer

1)a

A positive charge attracts a negative one and repels a positive one. A positively charged object can also attract a neutral object by polarizing the object. Here, molecules will be polarized with more negative charge towards the positive one

Thus, Z is positively charged, but Y can be negatively charged or neutral.

e is the answer

1)b

number of electric field lines only depends upon the charge.

for positive charge electric field is radially outwards

N1=N2

1)c

Assume that the three charges together creat an electric field. Find the location of a point (other than at infinity) where the electric field is zero.

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