16. Since Y and Z repel, then Y and Z must be of the same sign. Then, X must have theCopposite sign as it attracts both Y and Z17. Moving along the same direction as the current electric field will not cause a change.C, DHowever, moving up and down will cause a change in the direction of the field.18. The neutral sphere must still retain both positive and negative charges. The negativeCcharges in the neutral are repelled by the negative metal sphere and the positive is attracted.Since the positive is closer, the attractive force will be greater.19. Since one of them is attracting and the other is repelling, we know that they are differentBsigns. As we can see, they have relatively the same number of lines, meaning that their magnitudes are similar. Lastly, gravitational force cannot be a repelling force.20. First, the positive charges are repelled towards the right sphere. When the right sphere is Cdetached, it retains the positive charge, leaving mostly negative charges in the left sphere.
- Fall '08
- AP, Electric charge, C decreases