4. (10 points) In problem 3, what is the direction of the electric field between

Question

4. (10 points) In problem 3, what is the direction of the electric field between points A and B, and how the electric potential is compared between points A and B?

(a) Electric field is directed from A to B, and electric potential VA > VB

(b) Electric field is directed from A to B, and electric potential VA < VB

(c) Electric field is directed from A to B, and electric potential VA = VB

(d) Electric field is directed from B to A, and electric potential VA > VB

(e) Electric field is directed from B to A, and electric potential VA < VB

I only want carification on question #4 as to why the answer is E.

I understand that the EPE would be greater at VB than VA. However, I am unsure of the rule for electric fields.

Please help me understand!!

3. ( 10 points) A proton (mass-1.67x10-27kg, charge = 1.6 x 10-19C ) moving horizontally to the right at a speed of 1.5×105 m/s enters a uniform electric field at point A (the electric field lines are not shown). It is observed that in the electric field the proton moves in a straight line but slows down and comes to a momentary rest at point B. Find the difference (absolute value) in electric potential at points A and B Neglect gravity (a) 7.83x10-6V (b) 1.57x10-3V (c) 58.7 V (d) 117.4 (e) 234.81V .nna)= (4(1.67x10-27kg)(1.5×10sm/s)2)-1 17.4V

Explanation / Answer

#4

Since the proton slows down as it moves from A to B we can say that its direction of electric field is opposite to the motion of proton which slows down the speed of the proton here

So electric field direction is from B to A

Also in the opposite direction of the field Potential will always increase so as the proton moves to point point its the opposite direction and hence potential of B will be more than potential of A

(e) Electric field is directed from B to A, and electric potential VA < VB

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