Electric Circuits Answers

Three charged particles are arranged on corners of a square. (i) What is the direction of the electric field at the upper right corner?

A very small ball has a mass of 5.00 x 1023 kg and a charge of 4.00C. What magnitude electric field directed upward will balance the weight of the ball so that the ball is suspended motionless above the ground?

A small 2.00 g plastic ball is suspended by a 20.0 cm long string in a uniform electric field. If the ball is in equilibrium when the string makes a 15.0 degree angle with the vertical, what is the net charge on the ball?

an amplifier's open circuit output voltage is 10V peak to peak. if when a 10KΩ load is connected the output voltage drops to 8V peak to peak determine the amplifier's output resistance

A given amplifier is capable of presenting three different input resistance of 200Ω , 50KΩ and 1MΩ. If the amplifier's power gain is 1000 and it's voltage gain is 100 , determine which input to use to provide maximum power output and which to use to provide maximum output voltage for a low impedance microphone of 500Ω and 20mV open circuit voltage determine the power and voltage outputs

An amplifier has an input signal of 5V at 0.1mA. The output of the amplifier provides 10mA to a 450Ω load
determine : a) the current , voltage and power gains
b) the input resistance to the amplifier

The input voltage to an audio amplifier is 25mV. An oscilloscope connected across a 1MΩ resistor in series with the input to the amplifier indicates 1V peak-to-peak. If the voltage across a 10KΩ load is 3.5V. Determine :
a) the current, voltage and power gains
b) the amplifier's input resistance

Two particles, with charges of 20.0 nC and 40.0 nC are placed at the points with coordinates (0, 4.00 cm) and (3.00 cm, 0). A particle with charge 10.0 nC is located at the origin. (a) Find the electric potential energy of the configuration of the three fixed charges.

Two point charges Q1 = +5.00 nC and Q2 = -3.00 nC are separated by 35.0 cm (a) What is the electric potential at a point midway between the charges? (b) What is the potential energy of the pair of charges?

Two point charges are on the y-axis. A 4.50C charge is located at y=1.25 cm, and a -2.24C charge is located at y=-1.80 cm. Find the total electric potential at (a) the origin and (b) the point whose coordinates are (1.50 cm, 0).