17.50. Set Up:The proton has charge and the electron has charge The electric field of a point charge isdirected away from the charge if it is positive and toward the point charge if it is negative. Use coordinates where thexaxis is along line ABCand the direction is toward Cand where the direction is toward the proton. Theelectric fields due to each charge at A, Band Care sketched in Figure 17.50.Figure 17.50Solve: (a)At point Athe xcomponents of the fields cancel and the net field is in the direction.(b)At Bboth fields are in the direction and the net field is in the direction.(c)At C,as at A,the xcomponent of the fields cancel and the net field is in the direction.17.51. Set Up:Electric field is away from positive charge and toward negative charge.Figure 17.51Solve: (a)The electric fields
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