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Determine the forward bias voltage in each diode required to yeild diode currents of 1mA.
A battery charger is connected to a dead battery and delivers a current of 6.0 A for 5 hours, keeping the voltage across the battery terminals.
The wall socket provides 120 Volts. What voltage does the secondary coil of the transformer provide?
Find an expression for the input impedance of a section of the line of length l. Show that this is (Z0^2)/R if l = lamba/4.
The problem here is to design an "ideal" three-way light bulb which appears equally-spaced in its three brightnesses.
Write an algebraic expression for the voltage developed between the plates at radii a and b. Your answer will include the parameters Q and a and b.
Using the values for VR4 and VR5, from the step above write a KCL equation for the currents at the node point N
Calculate the self-inductance of the coil and the emf induced in it when the direction of a DC current of 5A flowing in it is reversed in 0.2 sec?
A battery that supplies an emf of 6.0 V has an internal resistance of 0.20 ohm. It is connected to a load resistor of 8.8 ohms.
If the resistance of the wire and the bar together is 2.5 ohms, what current flows through the wire and bar?
The current in a 48.1 mH inductor changes with time as I = bt^2 - at. With a = 2.7 A/s and b = 3 A/s^2, find the magnitude of the induced emf at t = .992 s.
Imagine that we have two metal rails 20 cm apart connected by a light bulb. The rails are placed in a 1.0 T magnetic field oriented vertically downward.
Explain how that surface charge distribution causes a current to flow in the circuit.
During the course of 0.130s, the field is changed to one of 0.310 T pointing down. What is the average induced emf in the coil?
Determine the voltage drop (from top to bottom) across the 16ohm resistor. Also, determine the voltage drop (from top to bottom) across the 4ohm resistor.
A coin 2.0 cm in diameter is held 20 cm from a concave spherical mirror of 30 cm radius of curvature. Locate the image of the coin and its height?
Draw a phasor diagram for this condition indicating the terminal voltage, armature current, location of direct and quadrature axes.
If the magnetic field decreases to zero in a time of 0.52 s, what is the magnitude of the average emf induced in the loop?
If the magnetic field changes at the previously mentioned rate over an area of 1.91 10-2 m2, what is the induced emf?
Consider the circuit of Figure in which the switch has been open for a long time prior to t=-0. Determine the values of vc(t) before t=0.
The smaller loop of (raduis r ) and is above the larger loop (raduis R) by a distance X>>R.
If the rod has a resistance of 18ohms and the rails and connector have negligible resistance, what is the current in the rod?
Write down the maxwell's equations of electromagnetism, and state the laws they represent. Explain the meaning of all the symbols used.
The magnitude of the earth’s magnetic field at the surface of the earth is slightly less than one gauss.
Figure represents the equivalent circuit of a voltage regulator where an unregulated 12V source is used to provide a stabilised voltage.