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

Question

1. The lines show equipotential contours in the plane of three point charges, Q1, Q2, and Q3. The positions of the charges are marked by dots. The values of the potentials are in kilovolts as indicated, e.g., +5 kV, 5 kV; the contour interval is 1 kV. The letters denote locations on the contours. For distances use the scale below the picture, to an appropriate accuracy. Select all the correct statements, e.g., AB. Hint: The potential near a point charge decreases as 1/distance from the charge. The distance at which the potentials have a given value tells the size and sign of the charges involved.

A. The force on an electron at g points to the bottom of the page.

B. Q3 is a positive charge.

C. The electric field at f is zero.

D. The electric field at j is stronger than at i.

E. Charge Q2 has the largest magnitude.

F. Charge Q3 has the largest magnitude.

2. Calculate the magnitude of the electric field at g.

Explanation / Answer

From the diagram we can see

a. at point g, the electric field points from Q3 to Q2

hence force on electron at point g is to the bottom of the page

hence true

b. as potenial near Q3 > 0, hence it is +ve

True

c. electric field is 0 where the potetial lines are farthest, like point k maybe

hence

False

d. closer the equipotential ;ilnes, stronger the field

hence field is stronger at i than j

hence flase

e. as Q2 has closest equipotential lines, it is strongest

hence true

f. Fasle ( from e)

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.