Q4: Time (30 minutes)\ A. Consider the two cases shown at right, in Case A, a point charge

+q

is a distance s from the center of a small ball with charge

+Q

. In Case B the point charge

+q

is a distance

s

from the center of a rod which is iniformly charged with a total charga

+Q

. Two PHYA21 students gre having the following dialog:\ Stident 1:- The charged rod and the chavged ba have the same charge

+Q

and are the same oisfance from the point charge

+q

. So the force on

+q

will be the seme in both cases."\ Student 2.

No

, in Caso

B

there are charges spread all ower the rod. The charge directly Delow the point charge wil exert the same force on

+q

as the bsill in Case

A

. The rest of the charge on the rod inil make the force in Case B bigger."\ Do you agree with any student? If not, what is (are) the error(s) made by the student(s), if any? how would the forces compare? Explain.\ B. Three identical positive charges of magnitude

Q

are iocated at the comers of a triangle of side

L

, as shown in the Figure to right. Assume that

Q=24.2\\\\mu C

&

L=16.7cm

.\ i. Determine the magnitude of the net force on each charge.\ ii. Will the magnitude of the net force be affected if one of the charges is replaced by a negative charge

-Q

? Explain your reasoning.

Q4: Timo ( 30 minutes) A. Consider the two cases shown at right, in Case A; a point charge +q is a distance s from the center of a small ball with charge +Q. in Case B the point charge +q is a distance s from the center of a rod which is uniformly charged with a total charga +Q. Two PHYA21 students are having the following dialog: Stident 1. "The charged rod and the changed bew have the same charge +Q and are the same oustance from the powit charge +q. So the fares on +q will bo the seme in both casas.: Stwolent 2. No, in Case B bhere are charges spread all ower the rod The charge directly below the point charge will exert the same force on +q as the bsil in Case A. The rest of the charge on the rod ivil make the farce in Case B bigger," Do you agree with any student? If not, what is (are) the error(s) made by the student(s), if any? how would the forces compare? Explain. B. Three identical positive charges of magnitude Q are located at the comers of a triangle of side L, as shown in the Figure to right. Assume that Q=24.2C \& L=16.7cm. I. Determine the magnitude of the net force on each charge. ii. Will the magnitude of the net force be affected if one of the charges is replaced by a negative charge Q ? Explain your reasoning