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Chapter 26: Q. 28 (page 738)

What is the equivalent capacitance of the three capacitors in Figure Ex26.28?

Short Answer

Expert verified

The equivalent capacitance of the three capacitors is25渭F.

Step by step solution

01

Given information

We need to find that the equivalent capacitance of three capacitors.

02

Capacitance of capacitor

The capacitance of the capacitors with capacitance 20渭Fand 30渭Fconnected in parallel will be given as

c12=11C1+1C2=1C1+C2C1C2=C1C2C1+C2

Putting the values we get

C12=2路10-5路3路10-55路10-s=12渭F

Now, the capacitance of the circuit is the capacitance of C12in parallel with C3=13渭F. That will be

C=C12+C3=12+13=25渭F

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Most popular questions from this chapter

Figure Q26.7 shows an electric field diagram. Dashed lines 1 and 2 are two surfaces in space, not physical objects.

a. Is the electric potential at point a higher than, lower than, or equal to the electric potential at point b? Explain.

b. Rank in order, from largest to smallest, the magnitudes of the potential differences 鈭�Vab,鈭�Vcd,and鈭�Vef.

c. Is surface 1 an equipotential surface? What about surface 2? Explain why or why not.

What is the equivalent capacitance of the three capacitors in Figure EX26.27?

Estimate the electric fields E鈫�1andE鈫�2at points 1 and 2 in Figure Q26.5. Don鈥檛 forget that E鈫�is a vector.

The electric potential along the x-axisisV=100x2V, where xis in meters. What is Exat

(a) x=0mand

(b) x=1m?

The label rubbed off one of the capacitors you are using to build a circuit. To find out its capacitance, you place it in series with a 10渭F capacitor and connect them to a 9.0V battery. Using your voltmeter, you measure 6.0V across the unknown capacitor. What is the unknown capacitor's capacitance?
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