Electricity and Magnetism Answers

A solenoid has a magnetic reluctance of 0.0022. It has 300 turns. If the current flowing is 0.5 A, find the total flux in max wells.

The primary coil of a transformer contains 24 turns of wire. The secondary coil of the transformer contains 1200 turns of wire. 

The primary coil is connected to an alternating potential difference of 6.0 V. Calculate the potential difference across the secondary coil. 

a 7.0 mm diameter copper wire carries a current of 0.7ua.what is the current density?

Two Zuc point changes are located on the x-axy. One is at x= Im and the other is at n=-1m.

(a). Determine the electric field on the y-axis at

y=0.5m

the search coil has 200 turns and a cross sectional area of 3.5 x 10^-5 m². the search coil is placed at x = 0.070 m. show that the magnetic flux linkage through the search coil is about 5x 10^-4Wb

Radio waves and gamma rays are parts of the electro magnetic spectrum. Which of the following is true about the energy carried by this waves

A. All electro magnetic waves carry the same energy

B. Radio waves carry the lowest energy since they have the lower frequency

C. Gamma rays carry the lowest energy since they have the lowest frequency

D. Radio waves carry the highest energy since they have the highest energy

AM 630 is where I listen to sports. The frequency is 630 kHz( or 630,000 hz). What is the wavelength

1.0 Three equal charges of +6 nC are located at the corners of an equilateral triangle (3) whose sides are 12 cm long, as shown below. Find the potential at the center of the triangle.

2.0 Define the electronvolt.

(2)

oint A. -9 +4x10 C

 2.1 In the Millikan experiment, an oil drop carries four electronic charges (3)

and has a mass of 1.8 x 10-12 g. It is held almost at rest between two horizontal charged plates 1.8 cm apart. What voltage must there be between the two charged plates? (Take electron charge e = 1.60 x 10-19 C)

3.0 Compute the energy stored in a 60𝑝𝐹 capacitor (5)

a) When Charged to a potential difference of 2𝑘𝑣

b) When the charge on each plate is 30𝑛𝐶

A potential difference of 100 V is applied to the primary coil of a transformer. The current through the primary coil is 2.0 A. The potential difference across the secondary coil is 15 V

Calculate the current flowing through the secondary coil.