Other Physics Answers

5. An electron has a kinetic energy of 6.4 X 10^-19 J. What is this energy in electron volts?

6. Two metallic plates are 0.04 m apart and the potential difference between them is 50 V. Between the two equipotential surfaces, there is a potential difference of 2.5 V. Find the spacing in this part of the field between two metal plates.

3. Four point charges are placed at the four corners of a square that is 30 cm on each side. Two of the 4 charges are +2μC and two are -2μC. Find the potential at the center of the square.

4. The potential difference between two parallel plates of a condenser that are 4 mm apart is 800 V. What is the potential gradient?

A. If you do 12 J of work to push 0.001 C of charge from point A to point B in an electric field, what is the potential difference between points A and B?

B. What will be the increase in kinetic energy of an electron if it has been accelerated through a potential difference of 20 million volts? (Assume that e = 1.6 X 10^-19 C)

 A car initially traveling at a speed of 16 meters per second accelerates uniformly to a speed of

20 meters per second over a distance of 36 meters.  What is the magnitude of the car’s acceleration?

An electric iron is rated 500W, 200V calculate the :

(a) the current required to operate the iron

(b) the heat generated in 30minutes.

What is the electric potential 15.0 cm from a point charge?

(a) Calculate the capacitance of a parallel-plate capacitor whose plates are 20 cm x 30 cm and are separated by a 1.0-mm air gap.

(b) what is the charge on each plate if a 12-V battery is connected across the two plates?

(c) What is the electric field between the plates?

A coil receives an electric power of 4500 W from a supplied voltage of 240 V. What is the resistance of the coil?

A circular has a resistor with a resistance of 3Ω followed by three parallel branches each holding a resistor with a resistance of 5Ω. What is the equivalent resistance of the circuit?

An insulating sphere with a radius of 20 cm caries a uniform volume charge density of 1.5×10^-6 C/m^3. Find the magnitude of the electric field of a point inside the sphere that lies 8.0cm from the center