Free problems arranged by topic
 Kinematics Dynamics Conservation laws Thermodynamics Waves Electricity Magnetism Optics Fluids and elasticity Ideal gas AC current

 Free problems: all problems
 Kinematics Dynamics Conservation laws Thermodynamics Waves Electricity Magnetism Optics Fluids and elasticity Ideal gas AC current

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# Physics problems:electricity

capacitors

Problem 29.

A parallel-plate air capacitor has a capacitance of 800 pF. The charge on each plate is 6 µC. What is the potential difference between the plates?

Solution

Problem 30.

A parallel-plate air capacitor of capacitance of 100 pF has a charge of magnitude 0.1 µC on each plate. The plates are 0.5 mm apart.

(a) What is the potential difference between the plates?

(b) What is the area of each plate?

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

(d) What is the surface charge density on each plate?

Solution

Problem 81.

Find the equivalent capacitance of the capacitors shown in the figure.

Solution

Problem 82.

Find the equivalent capacitance of three capacitors shown in the figure.

Solution

Problem 83.

What is the charge on  capacitor?

Solution

Problem 84.

What is the charge on  capacitor?

Solution

Problem 85.

What is the charge on and the potential difference across  capacitor?

Solution

Problem 86.

The charge on  capacitor is . What is the capacitance of capacitor  (see figure)?

Solution

Problem 87.

Find the energy stored in the system of capacitors shown in the figure.

Solution

Problem 88.

Two 1.0 cm x 1.0 cm metal electrodes are spaced 0.5 mm apart and connected to 12 V battery. What are the charge on each electrode and the potential difference between them?

Solution

Problem 89.

A parallel plate capacitor consists of two 5.0 cm x 5.0 cm metal electrodes spaced 1.5 mm apart. The capacitor is connected to a 10 V battery. How much energy is stored in the capacitor?

Solution

Problem 90.

An isolated parallel-plate capacitor with the capacitance of  has  charge on it. An external force increases the distance between the plates by a factor of 2. How much work is done by the external force?

Problem 91.

What is the charge on  capacitor?

Solution

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