Questions from Modern Physics

Q: The electric potential V in a region of space is given by

The electric potential V in a region of space is given by where A is a constant. (a). Derive an expression for the electric field E S at any point in this region. (b). The work done by the field w...

Q: The maximum voltage at the center of a typical tandem electrostatic accelerator

The maximum voltage at the center of a typical tandem electrostatic accelerator is 6.0 MV. If the distance from one end of the acceleration tube to the midpoint is 12 m, what is the magnitude of the a...

Q: Equation (24.2) shows that the capacitance of a

Equation (24.2) shows that the capacitance of a parallelplate capacitor becomes larger as the plate separation d decreases. However, there is a practical limit to how small d can be made, which places...

Q: A cylindrical rod has resistance R. If we triple its length

A cylindrical rod has resistance R. If we triple its length and diameter, what is its resistance, in terms of R?

Q: Suppose the two plates of a capacitor have different areas. When

Suppose the two plates of a capacitor have different areas. When the capacitor is charged by connecting it to a battery, do the charges on the two plates have equal magnitude, or may they be different...

Q: To store the maximum amount of energy in a parallelplate capacitor with

To store the maximum amount of energy in a parallelplate capacitor with a given battery (voltage source), would it be better to have the plates far apart or close together?

Q: When is a 1.5-V AAA battery not actually

When is a 1.5-V AAA battery not actually a 1.5-V battery? That is, when do its terminals provide a potential difference of less than 1.5 V?

Q: (a). Calculate the electric potential energy of the adenine–

(a). Calculate the electric potential energy of the adenine–thymine bond, using the same combinations of molecules (O-H-N and N-H-N) as in Exercise 21.21. Exercise 21.21: (a). Calculate the net for...

Q: Two protons, starting several meters apart, are aimed directly at

Two protons, starting several meters apart, are aimed directly at each other with speeds of 2.00 × 105 m/s, measured relative to the earth. Find the maximum electric force that these protons will exer...

Q: Three equal 1.20-µC point charges are placed at

Three equal 1.20-µC point charges are placed at the corners of an equilateral triangle with sides 0.400 m long. What is the potential energy of the system? (Take as zero the potential energy of the th...