Electric Circuits Answers

how one can determine the effective mass from the hall resistance in a constant temperature and different magnetic field.? and how is it possible to find the g-factor from hall resistance?

A point charge, -30µC, is placed at the origin of coordinates. Find the electric field at the point x=5m on the x-axis

A fan is operated with a 6v battery, which is driven by a permanent magnet dc motor. by using an ammeter we found that when the fan was held stationary, the motor drew 1 amp and when it was released it rotated at 6000rpm and drew 500 mA (0.5A). How much torque is required to drive the fan at this speed? How much power is the motor developing? How efficiently is the motor running?

An electrical circuit has the following three components connected in parallel to a 50 Hz AC supply:
 120 Ω resistor
 100 μF capacitor
 A coil of resistance 25 Ω and inductance 0.5 H
Here is information about the phasor diagrams:
 Capacitive reactance (Xc) leads resistance by 90°

 Inductive reactance (XL) lags resistance by 90°
 Xc = 1/2πFc (Ω)
 XL = 2πFL (Ω)
 Sketch the circuit.
 Calculate the reactance of each component.
 Sketch a phasor diagram for the circuit.
 Calcuate the impedance of the circuit.
 Express your answer in Cartesian (rectangular) and polar form.

An 19.5 W device has 9.30 V across it. How much charge goes through the device in 4.15 h?

A fuse in an electric circuit is a wire that is designed to melt, and thereby open the circuit, if the current exceeds a predetermined value. Suppose that the material to be used in a fuse melts when the current density rises to 390 A/cm2. What diameter of cylindrical wire should be used to make a fuse that will limit the current to 0.66 A?

In a CRO the signal input voltage is given to the horizontal deflection plates. state True or false, also give reason of your answer.

Highest Modulus of the ring counter made up of 5 flip-flops is 25.State true or false, also give a reason for your answer.

IC 7805 and IC 7905 must always be used together. state true or false, also give a reason of your answer .