Megnetic effect of electric current: Field due to 4 wires.

"Consider the four current-carrying wires described in the figure below. Each of these wires is long and straight, and carries the current I either into or out of the page, as shown." What is the direction of the net magnetic field produced by these four wires at the center of the square? Please see attached for diagram.

Kirchoff's Rules

Consider the group of resistors shown in Figure 21-37, where R1 = 4.0ohms and E= 9.1 V. Find the current in each resistor. And determine the potential difference between points A and B. Please see attached for diagram.

Capacitors

Consider a group of capacitors, where C1=14 µF and C2=6.8 µF. Terminals A and B are connected to a 9.0 V battery. Find the energy stored in each capacitor. 14 µF capacitor : 6.8 µF capacitor : 22 µF capacitor: Please see attached for diagram.

Current Flowing Through a Battery

In the figure below, R1 = 19ohms and R2 = 6.3ohms. What is the current flowing through the battery immediately after the switch is closed, and what is it long after the switch is closed? Pleases see attached for diagram.

Resistors and Batteries

If points A and B in the figure below are connected to a 10 V battery, what is the power dissipated in each of the resistors assuming that R = 65 ohms. 12 ohms resistor : 55 ohms resistor : 65 ohms resistor : Please see attached for diagram.

Capacitors in Parallel

Two capacitors, one 6.6 µF the other 29 µF, are connected in parallel across a 12 V battery. What is the equivalent capacitance of the two capacitors? And what is the charge stored on each capacitor? Q 6.6 µF = Q 29 µF: =

need step by step solution

Review problems 1) Two converging lenses with focal lengths of 40cm and 20cm are placed 10cm apart. A 2cm tall object is 15cm from the 40cm focal length lens. a) Use ray tracing to locate the image of the lens combination. b) Is the image real or virtual? Is it upright or inverted? c) Calculate the exact location and height ...continues

Resonance in an AC circuit

How to do part (b) of the following problem? An RLC circuit has a capacitance of 0.43 microF. (a) What inductance will produce a resonance frequency of 95 mHz? (b) It is desired that the impedance at resonance be 1/2 the impedance at 11 kHz. What value of R should be used to obtain this result?" I've done (a) (answe ...continues

changing magnetic field

Transcranial magnetic stimulation (TMS) is a noninvasive method for studying brain function, and possibly for treatment as well. In this technique, a conducting loop is held near a person's head. When the current in the loop is changed rapidly, the magnetic field it creates can change at a rate of {see attachment}. This rapidly ...continues

RL circuits

Consider the circuit shown in Figure 23-36 {see attachment}, in which = 4.5 V. After the switch has been closed for a long time the energy stored in the inductor is 0.09 J. What is the value of the resistance R?