Blog

The electric field strength is 4.60×104  N/C inside a parallel-plate capacitor with a 2.20 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)

LR circuits: A 45-mH ideal inductor is connected in series with a 60-Ω resistor through an ideal 15-V DC power supply and an open switch. If the switch is closed at time t = 0 s, what is the current 7.0 ms later?

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

Resistivity: A wire of resistivity ρ must be replaced in a circuit by a wire of the same material but 4 times as long. If, however, the resistance of the new wire is to be the same as the resistance of the original wire, the diameter of the new wire must be

A student wants to make a very small particle accelerator using a 5.8 V battery. a) What speed will a proton have after being accelerated from rest through the 5.8  V potential difference? b) What speed will an electron have after being accelerated from rest through the 5.8  V potential difference?

The electron drift speed is 2.3×10−4  m/s in a metal with a mean free time between collisions of 4.0×10−14 s. What is the electric field strength?

The 85 

Household wiring often uses 2.0 mm diameter copper wires. The wires can get rather long as they snake through the walls from the fuse box to the farthest corners of your house. What is the potential difference across a 18 m long, 2.0 mm diameter copper wire carrying an 7.0 A current?  (Resistivity of copper = 1.7 x 10-8 

a) How long must a 0.52 mm diameter aluminum wire be to have a 0.44 A current when connected to the terminals of a 1.5 V flashlight battery? (Resistivity of aluminum = 2.8 x 10-8

A 4.00