Electric Circuits Answers

An intravenous (IV) system is supplying saline solution to a patient at the rate of  0.120 cm 3 /sec  through a needle of radius  0.150 mm and length  2.50 cm. What pressure  is needed at the entrance of the needle to cause this flow, assuming the viscosity of the saline solution is  0.001 Pa · sec? The gauge pressure of the blood in the patient’s vein is         8.00 mm Hg.

A unirmly changes insulation de 140 cm bent into the shape of a semicircle as shown in the figure The rod has a total charge of -7.50 C. Find the magnitude and direction of the electric field at O, the center of the

Let the energy stored in the capacitor be U. Show that U is given by the expression: U=½Q²/C

[Hint: The power P in the capacitor is given by P=dV/dt =IV where I = dQ/dt. This is a simple exercise on integration.]

There are too conductors A & B of the same material.

having length l & 2l: & having radii r & r/2 respectively. what is the ratio of their resistances?

The temperature cofficient of copper is 0.004°c^-1. Find the

resistance of a 5 m long copper wire of diameter 0.2mm at

100°c it the resistivity of copper at 0ºc is 1.7 x 10^-8 ohm meter.​

A parallel-plate capacitor has 4.00cm² plates separated by 6.00mm of air. If a 12.0V battery is connected to this capacitor, how much energy does it store in Joules?

1. What is the magnitude of the electric field E at a field point 2.0 m from a point charge q=4.0 nC?

(a)   Applying Kirchhoff’s voltage law on the following circuit diagram

1.     Write a KVL equation for the loop ACDBA going clockwise from point A.

2.     Write a KVL equation for the loop ACEFDBA going clockwise from point A. 

(a)   Describe KCL and KVL     

(b)  Applying Kirchhoff’s current law, write an equation for the currents directed into and out of point X in the following figure. Also solve for the unknown current, I₃. 

(c)  Applying Kirchhoff’s voltage law on the following circuit diagram

(d)  Write a KVL equation for the loop ACDBA going clockwise from point A.

(e)  Write a KVL equation for the loop ACEFDBA going clockwise from point A.

A 10 W resistor ,15.9 mH inductor and 159 micro farad capacitor are connected in parallel to a 200V, 50 Hz source. Calculate the supply current.