Question

1. Two identical metal balls are suspended by insulating threads. Both balls have the same net charge. In this problem, do not assume the balls are point charges Ball 2 a. Draw a separate free-body diagram for each ball. Label the forces to indicate: . the object exerting the force, the object on which the force is exerted, • the type of force (gravitational, normal etc.), and • whether the force is a contact or a non- contact force. Preo-body diagram for ball : Free-body diagram for all 2 b. Suppose the charge on the second ball is reduced slightly, so that it is less than that on the first ball. Predict whether the angle that ball 1 minkes with the vertical will be greater than, less than or equal to the angle that ball 2 makes - with the vertical. Explain. Sketch your answer above. How does the free body dingram for each ball in this case compare to the corresponding free body diagram that you drew in part a? If the magnitudes or directions of any of the forces change, describe how they change C. Predict what will happen if the nel charge on ball 2 is reduced to ro. Make a sketch to illustrate your answer

I need help with all these please! Thanks!

Answer 1

solution: - FBD for ball one. fe Coloumb force. T: - Tension is string. fc :- T: - mg Coloumb force - non-contact force. Tension is string contact force. gravitational force non-contact force. 6 on second ball is reduced, coloumb fare when will charge decrease. , f = T'. sina Fc = T ein o T boso = T'= ma Coso si = f = ng ring = mg.tand mg.tand # 0' will be less than 0. a mga tano F = tano fano ن الله rano stano (osofe

and vice-versa. o will increase f boumb force increases decrease. if ng I will increase for coloumb force tame hero, © if not charge coloumb of on ball a becomes force will be zero. Fc=6, (0:0) between them. 2 0 rather than assigning signs to the forces, we assign direction to forcer. (lef ward (ughtwards), the signs are given accordingly. tue & rue charges repel, force will be rightwards. & ve & -ve charges attract, force will be right words. here both forces will add-up.

in case where there are more than two point charges, what we do is calculate force due to individual charges and (with their directions) and then sum them up. It gives us resultant of two forces.
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