The lines show the equipotential contours in the plane of three point charges. Q

Question

The lines show the equipotential contours in the plane of three point charges. Q_1. Q_2. and Q_3. The values of the potentials are in kV as indicated for the +5, 0. and -5 kV contours. The positions of the charges arc indicated by the dots. Decide which of the following statement about electric field lines arc true, and which are false. The letters are on the equipotential contours. (For each statement select T True, F False). Charge Q_3 has the smallest magnitude of all. The force on a proton at g points to the bottom of the page. Charge Q_2 is the largest negative charge. The electric field at j is stronger than at i. Q_1 is a negative charge. The electric field at k is zero. Calculate the external work required to move a negative charge. q= -8e (where e is, as usual, the charge of a proton) from 'b' to 'i' (as shown in the figure of the previous problem) at constant speed.

Explanation / Answer

A.) False

because the equipotential field line is much far away from the Q3 this show it has larger charge as compare to Q2 so this statement is false

B.) FAlse

force on proton at point g shouldbe upward as at bottom there is positive charge so it will repel the proton and hence force should be in upward direction

C.)True

as field line has spreaded in wider range so it should be largest negative among all

D.)FAlse

Electric field lines is more densed at i as compare to j so filed at i should be more

E.) True

Q1 is negative charge as electric potential is negative

F)

yes at k electric field is zero because the electric potential is zero or it is at eqipotential

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