capacitor

Hi. Can someone please check these two answers? (a) seems very low and (b) seems very high to me. A 0.22 micro-F capacitor is charged by a 1.5-V battery. After being charged, the capacitor is connected to a small electric motor. Assuming 100% efficiency, (a) to what height can the motor lift a 5.0-g mass? (b) What initial vol ...continues

Capacitors

Two capacitors are connected in parallel. If a third capacitor is connected in parallel with the other two, does the equivalent capacitance increase, decrease, or remain the same? Explain.

Fuses & Circuits

A fuse is a device to protect a circuit from the effects of a large current. The fuse is a small strip of metal that burns through when the current exceeds a certain value, thus producing an open circuit. Should a fuse be connected in series or in parallel with the circuit it is intended to protect? Explain.

RC circuit

Hi. Can someone please walk me through how to do this problem? Consider an RC circuit with epsilon = 12.0 V, R = 175 ohms, and C = 55.7 micro-F. Find (a) the time constant for the circuit, (b) the maximum charge on the capacitor, and (c) the initial current in the circuit. Thank you.

capacitors

Hi. Can someone please walk me through how to do the following problem? Two capacitors, one 7.5 micro-F and the other 15 micro-F are connected in a series across a 12-V battery. (a) Find the equivalent capacitance of the two capacitors. (b) Which capacitor stores more charge. Explain. (c) Find the charge stored on each capaci ...continues

series and parallel resistors

Hi. Actually, this is embarassing, but my question is simply an algebra question. I know the equation and I know the answer, but I can't remember how to GET the answer. Can someone please walk me through this very simple algebra issue? Equivalent resistance in a circuit = 26 ohms R1 and R2 are parallel resistors; R1 = 55 ohm ...continues

uniform electric field

"A uniform electric field produces an acceleration (10 m/s^2, 10 m/s^2,0) at (1 m, 1m, 1m) for a -5 micro Coloumb charge of mass 10 g. Write the electric field at all points in space. (Hint: it would be a good idea to know what uniform means here)." Please help me solve the problem stated above. So, uniform means constant acc ...continues

draw the electric field

"For some configuration of charge, the electric force on a positive charge is F(x) = gamma |x| x hat, where gamma is a constant. Draw the electric field using arrows on a square grid with 16 points placed symmetrically about the y-axis." Please help me solve and draw the solution. By the way, is this just a point charge?

charge density

"A reasonable upper limit on the amount of charge that can be safely applied to a person is 1 micro Coloumb. What charge density must be applied to the floor to float a person with mass 50 kg and charge 1 micro Coloumb? Model the floor as an infinite plane with uniform surface charge density." Please help me solve the problem ...continues

frequency, conceptual question

Hi. Can someone please check my answer to this conceptual Q? "Although an incandescent light bulb appears to shine with constant intensity, this is an artifact of the eye's persistence of vision. In fact, the intensity of a bulb's light rises and falls with time due to the alternating current used in household circuits. If yo ...continues