FM22 P42 Q4 Resultant Electric Force | Feb/March 2022 | Cambridge A Level 9702 Physics
9702/42/F/M/22: (a) State what is represented by an electric field line. #9702m22p42 #A2ResultantEfieldP4 #A2multiChargeP4 #Lv2
(b) Two point charges P and Q are placed 0.120 m apart as shown in Fig. 4.1.
(i) The charge of P is +4.0 nC and the charge of Q is –7.2 nC. Determine the distance from P of the point on the line joining the two charges where the electric potential is zero.
(ii) State and explain, without calculation, whether the electric field strength is zero at the same point at which the electric potential is zero.
(iii) An electron is positioned at point X, equidistant from both P and Q, as shown in Fig. 4.2. On Fig. 4.2, draw an arrow to represent the direction of the resultant force acting on the electron.
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