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Four charges Q(1), Q(2), Q(3) and Q(4) o...

Four charges `Q_(1), Q_(2), Q_(3)` and `Q_(4)` oof same magnitude are fixed along the x axis at `x=-2a, -a, +a` and `+2a`, respectively. A positive charge q is placed on the positive y axis at a distance `b gt 0`. Four options of the signs of these charges are given in List I. The direction of the forces on the charge q is given in List II. Match List I with List II and select the correct answer using the code given below the lists.

`{:(,"List-I",,,"List-II"),((P),Q_(1)","Q_(2)","Q_(3)","Q_(4) "all positive",,(1),+x),((Q),Q_(1)","Q_(2) " positive, "Q_(3)","Q_(4)" negative",,(2),-x),((R),Q_(1)","Q_(4)" positive ,"Q_(2)","Q_(3)" negative",,(3),+y),((S),Q_(1)","Q_(3)" positive , "Q_(2)","Q_(4)" negative",,(4),-y):}`

A

P-3, Q-1, R-4, S-2

B

P-4, Q-2, R-3, S-1

C

P-3, Q-1, R-2, S-4

D

P-4, Q-2, R-1, S-3

Text Solution

Verified by Experts

The correct Answer is:
A
When all are positive net field is along +y axis `P rarr 3`

when `Q_(1), Q_(2)` positive `Q_(3), Q_(4)` negative `Q rarr 1`

When `Q_(1), Q_(4)` positive and `Q_(2), Q_(3)` negative `R rarr 4`
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