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Chapter 25: Q. 23 (page 710)
A 3.0-cm-diameter parallel-plate capacitor has a 2.0 mm
spacing. The electric field strength inside the capacitor is.
a. What is the potential difference across the capacitor?
b. How much charge is on each plate?
a. the value of electrical potential is 200 V.
b. the charge value on each plate is
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shows three points near two point charges. The charges have equal magnitudes. For each part, rank in order, from most positive to most negative, the potentials to .
charge and a charge are located on the x-axis at and , respectively.
a. Other than at infinity, is there a position or positions on the x-axis where the electric field is zero? If so, where?
b. Other than at infinity, at what position or positions on the x-axis is the electric potential zero?
c. Sketch graphs of the electric field strength and the electric potential along the x-axis.
The electron gun in an old TV picture tube accelerates electrons between two parallel plates 1.2 cm apart with a 25 kV potential difference between them. The electrons enter through a small hole in the negative plate, accelerate, then exit through a small hole in the positive plate. Assume that the holes are small enough not to affect the electric field or potential.
a. What is the electric field strength between the plates?
b. With what speed does an electron exit the electron gun if its entry speed is close to zero?
Note: The exit speed is so fast that we really need to use the theory of relativity to compute an accurate value.
Your answer to part b is in the right range but a little too big.
What potential difference is needed to accelerate a ion (charge ) from rest to a speed of?
An electric dipole consists of spheres charged to at the ends of a -long massless rod. The dipole rotates on a frictionless pivot at its center. The dipole is held perpendicular to a uniform electric field with field strength , then released. What is the dipole鈥檚 angular velocity at the instant it is aligned with the electric field?
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