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)

In proton-beam therapy, a high-energy beam of protons is fired at a tumor.  As  the protons stop in the tumor, their kinetic energy breaks apart the tumor’s DNA, thus killing the tumor cells. For one patient, it is desired to deposit 0.08 J of proton energy in the tumor. To create the proton beam, protons are accelerated from rest through a 1.0×104 kV potential difference. What is the total charge of the protons that must be fired at the tumor? 

Two 5.6 cm x 5.6 cm metal plates are separated by a 0.19 mm thick piece of Teflon. (Dielectric constant for Teflon (

a) How long must a 0.62 mm diameter aluminum wire be to have a 0.48 A current when connected to the terminals of a 1.5 V flashlight battery? (Resistivity of aluminum = 2.8 x 10-8

Current: An electric device delivers a current of 5.0 A to a device. How many electrons flow through this device in 10 s? (e = 1.60 × 10-19 C)

What potential difference is needed to accelerate a He+ ion (charge +e, mass 4 u) from rest to a speed of 7.0 x 105 m/s? (mass of a proton = 1.67 x 10-27 kg, charge of electron = 1.6 x 10-19 C)