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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.

equivalent capacitance

Solution

 

Problem 82.

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

charge

Solution

 

Problem 83.

What is the charge on capacitance capacitor?

potential

Solution

 

Problem 84.

What is the charge on electric capacitor?

magnetic

Solution

 

Problem 85.

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

electric charge

Solution

 

 

 

Problem 86.

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

electric field

Solution

 

Problem 87.

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

voltage

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  charge has  current 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?

Solution

 

Problem 91.

What is the charge on charge capacitor?

current

Solution

 

 

 

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