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 balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that Two imaginary spherical surfaces of radius R and 2R respectively surround a positive point charge Q located at the center of the concentric spheres. When compared to the number of field lines N_1 going through the sphere of radius 2R, the number of electric field lines N2 going through the sphere of radius 2R is Three 2.50 MueC charges are placed on tiny conducting spheres at the ends of 1.00 m-long strings that are connected at 120degree angles as shown below. The magnitude, in N, of the force on the knot at the center

Explanation / Answer

1a)

Correct option :(e)

Reason: As X attracts Y, Y should have negative charge or neutral charge (Positively charged body attracts its unlike charged body (negative) as well as neutrally charged body also)

1b)

Correct option :(c)

Reason: The number of lines of force passing through the region is independent of the radius of the sphere.

1c)

Correct option: (a)

Reason: The forces due to each charge at the centre are equal in magnitude and make an angle of 120 degrees with each other. The vector addition of all the force vectors gives a null vector because their geometrical addition forms a closed triangle since the angle between successive vectors is equal to 120 degrees. Hence, the magnitude of net force is equal to zero.

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