Question

In the figure the electric field lines on the left have twice the separation as those on the right. (a) If the magnitude of the field at A is 47 N/C, what is the magnitude of the force on a proton at A? (b) What is the magnitude of the field at B?

Answer 1

a)

$$F=qE=(1.60\cdot 10^{-19})(47)=7.52\cdot 10^{-18}N$$

b) In the figure the electric field lines on the left (B) have twice the separation as those on the right (A).

$$E_B=0.5E_A=0.5(47)=23.5\frac{N}{C}$$