# PHYSICS

Two capacitors, C1=25.0x10^-6 and C2=5.0x10^-6 are connected in parallel and charged with a 100-V power supply.
a)calculate the total energy stored in the 2 capacitors
b) what potential difference would be required across the same 2 capacitors connected in series in order that the combination store the same energy as in a)?

ENERGY STORED=1/2C*DELTA V^2
1/2(25.0e^-6 + 5.0e^-6)(100)^2
=0.15KJ OR 150J, IS THIS RIGHT? IF NOT HOW DO I GET THE RIGHT ANSWER?

B)1/Ceq= 1/25.0e^-6 + 1/5.0e^-6= 4.16e^-6
DELTA V= SQRT 2x (ENERGY STORED=150J)/
4.16e^-6 = 8492v?????? CAN SOMEONE TELL ME IF IM DOING THIS RIGHT?

1. 👍 0
2. 👎 0
3. 👁 178
1. The stored energy that you calculate with that formula is in J, not kJ. The answer to the first part is 0.15 J

For the second part, require that
(1/2)Ceq*V^2 = 0.15 J, and solve for V. You are correct that Ceq = 4.167*10^-6 F

1. 👍 0
2. 👎 0
posted by drwls
2. so for part two i get 268V is that correct?

1. 👍 0
2. 👎 0
posted by nat
3. Yes

1. 👍 0
2. 👎 0
posted by drwls
4. yes

1. 👍 0
2. 👎 0

## Similar Questions

1.Write the number in standard form: 7.1x10^4 A)710 B)7,100 C)71,000 D)710,000*** 2.Write the number in standard form: 5.01x10^-3 A)5,010 B)0.501 C)0.0501 D)0.00501*** 3.Multiply (2.0x10^4)(3.0x10^3)=? A)6.0x10^7*** B)6.0x10^12

2. ### physics

Two capacitors to 3 uF charged to a 100 V, and the other to 200 V. Determine the voltage between the plates, if the capacitors connected in parallel Два конденсатора емкостью по 3 мкФ заряжены

asked by lisa on May 28, 2011
3. ### Chemistry

what is Kc at 25 celsius for the following equilibrium? CH3BH3^+ +H2O CH3NH2 + H3O^+ Kb=4.4x10^-4 I got 4.0x10^4 / 1.0x10^-14 = 4.0x10^-10 (correct)?

asked by Bb on March 22, 2013
4. ### physics

Lasers are used to try to produce controlled fusion reactions. These lasers require brief pulses of energy that are stored in large rooms filled with capacitors. One such room has a capacitance of 64 10-3 F charged to a potential

asked by Laurie on January 12, 2012
5. ### Physics

Using Coulomb's law to solve: Charge A is +2.0x10^-6C and charge B is +3.0x10^-6C. The two changes are 3 m apart. What is the force between them?Is the force attractive or repulsive? Okay so here's what I have so far

asked by ANONYMOUS on March 28, 2017
6. ### Physics

A)Two identical resistors are connected in parallel across a 30-V battery, which supplies them with a total power of 7.0 W. While the battery is still connected, one of the resistors is heated so that its resistance doubles. The

asked by Kristi on October 22, 2011
7. ### Physics

A)Two identical resistors are connected in parallel across a 30-V battery, which supplies them with a total power of 7.0 W. While the battery is still connected, one of the resistors is heated so that its resistance doubles. The

asked by Kristi on October 24, 2011

book says: (4-4.00x + x^2)(6.00x10^-6C)= x^2(15.0x10^-6C) they got: 3.00x^2+ 8.00x-8= 0 I don't get how they got that quadradic equation. (I mulitplied over and then divided the 15.0x10^-6 over and I didn't get what the book got)

asked by ~christina~ on April 2, 2008
9. ### Physics Capacitance

Three uncharged capacitors, X, Y, Z, each with capacitance of 12uF each are connected A---------[X]------[Y/Z]-----------B *Y&Z is parallel to each other* A potential difference of 9.0V is applied between points A and B. Explain

asked by Ariana on April 25, 2015
10. ### Phys1

A 2μF capacitor is charged to 50V and then connected in parallel with a 4μF capacitor charged to 100 V.? Determine (a) the charge and potential difference of the system, (b) the charge on each capacitor of the system, (c) the

asked by good eve on April 24, 2016

More Similar Questions