Cylindrical capacitors: A metal cylinder of radius 2.0 mm is concentric with another metal cylinder of radius 5.0 mm. If the space between the cylinders is filled with air and the length of the cylinders is 50 cm, what is the capacitance of this arrangement? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)

A water molecule perpendicular to an electric field has 2.50×10−21 J more potential energy than a water molecule aligned with the field. The dipole moment of a water molecule is 6.2 x 10-30 Cm. What is the strength of the electric field?

a) How long must a 0.60 mm diameter aluminum wire be to have a 0.54 A current when connected to the terminals of a 1.5 V flashlight battery? (Resistivity of aluminum = 2.8 x 10-8

In the figure shown below, q = -3.1 nC. What is the electric potential at the point indicated with the black dot? Make sure to include units. 

A 4.00 

The 85 

The electric field strength is 5.50×104  N/C inside a parallel-plate capacitor with a 2.50 mm  spacing. A proton is released from rest at the positive plate. What is the proton’s speed when it reaches the negative plate? (mass of proton = 1.67 x 10-27 kg, charge of an proton = 1.60 x 10-19 C)

The electric potential along the x-axis is V = 100e-2x V, where x is in meters. a) What is the Ex at x = 1.0 m? b) What is the Ex at x = 2.9 m?

In the figure shown below, q = -3.4 nC. What is the electric potential at the point indicated with the black dot? Make sure to include units. 

What potential difference is needed to accelerate a He+ ion (charge +e, mass 4 u) from rest to a speed of 8.0 x 105 m/s? (mass of a proton = 1.67 x 10-27 kg, charge of electron = 1.6 x 10-19 C)