Question

Possibly useful equations: Electric force: F-kqqz/? Force from E field: F=qE Electric potential: V - kq/r PE-V Mag Fld near wire: B = d.l/2xr F-qvBsine E=q/4ter? Plate A: 100 cm long 1. The electric field lines running between a plate at 4 V and a plate at 0 V are observed to be as follows: A) Which plate (A or B) is the one at OV? How do you know? Plate B: 40 cm long B) On the above picture, draw (and label!) reasonable equipotential lines for V = 1 volt, V = 2 volts, and V = 3 volts. Where nearer to plate A or nearer to plate B) should your equipotential lines be closer together? Why? C) If an electron is moved from the point where your V = 2 V equipotential line crosses the leftmoſt field line to the point where your V=1 V equipotential line crosses the rightmost field line, what is the change of its electrostatic potential energy? The charge on an electron is -1.6x10-19C.

Answer 1

Plate A: 30oom long Plate B: 40 cm long A) The electric - field lines directed away from a tve charge and towards a negative change le Dire.ded away potention towards a & Plate B is one at from a higher lower potential. ov.. lines are perpendicular B) Equipotential to field lines, NAV ; ; ܐܶ 1:30 V:27 ܐ 1V11Tv OV Equipotential lines are together near Plate A longer than blate B. closer as it is Scanned with CamScanner

o potential energy of electron = au . = mev. Initial Final change P.E= e. (2v) Pez e, (iv) in PE = eilav)-e (IV) = (1,6x10-19 () 130) . -199a . lnctio Scanned with CamScanner