Question

Could anyone explain the following question step by step? thank you!

craig/Phy51 F'19 Quiz 2b: Ranking the Electric Fleld In each of the 7 diagrams below there are 2 charges ofequal magnitude. In each case we are interested in the magnitude of the electric field at the point P. A B C G E F Rank these situations from the strongest to the weakest.. If situations are equal indicate that but putting them at the same rank. Weakest 6 7 Strongest 1 G 2 A 3 RC 4 EF 5

Answer 1

Here we apply Coulomb's law and electric field superposition principle.

AM We know, electi ield of point charge given by coulomba daw choge magnitude dtane o point em ctarje xacially outwr d k to nejative it adaly insa Here V= for pasitive charge, E is divected (A) Let 1 box idth 1 m Magirhue harge AM 1M K= V E V 4eo 4e (22 K HED ngotive churges Frest E2p bo-th are 2P t A SK (B) Here Ep 2m- 4- but rectiaaa are (Enet k- |(Ene)e 3K o(c) lettward E2 Cigkt ward) K 4- EP t

K- Ene) 3K oEnet) 4 Ep Fa= K taard 26 But both Selda are K4K ESK EnesD Eip4C AnE Ee ATEC Ofpaitely directed both feld care = K-K O Here aluo beth fields ppasitely hected aye K-K |(Enei)p Hexe both ane ](Enes = KtK =2x AroM above Calculation G DA B = C >E =F くt