Two point charges Q1 = +5.55 nC and Q2 = −2.05 nC  are separated by 30.0 cm.  What is the electric potential at a point midway between the charges?   What is the potential energy of the pair of charges? What is the significance of the algebraic sign of your answer?

Consider the figure shown below. Q1=1.5×10−9 C and Q2=−8.4×10−9 C. Charges Q1, Q2, and point '3' are all located at integer coordinates that you can read off of the graph. Assume the electric potential at infinity is zero. a) Calculate the electric potential at the location marked '3'.

A proton has an initial speed of 5.0×105 m/s. Please give a correct/clear explanation of all constants or values used to solve each part: a> What potential difference is required to bring the proton to rest? Express your answer using two significant figures.  b>What potential difference is required to reduce the initial speed of the proton by a factor of 2? Express your answer using two significant figures.  c>What potential difference is required to reduce the initial kinetic energy of the proton by a factor of 2? Express your answer using two significant figures.

The three charges in the figure below are at the vertices of an isosceles triangle. Let q = 9.00 nC and calculate the electric potential at the midpoint of the base. (Let d, = 2.50 cm and d, = 5.00 cm.) d2 d1

Q 3 please

A line of charge with a non-uniform charge density λ=ay, where a=−10 nC/m2 lies along the y axis with one end at the origin and the other at y=h, where h=0.5 m. What is the total charge? What is the electric potential of this line charge at point P?

The electric potential at a certain point in space is  15 v . What is the electric potential energy of a   4 uC charge placed at that point?       19 uJ     60 uJ     zero     11 uJ