Electricity and Magnetism Answers

Three charges lie along the x-axis. The positive charge q1 = 15.0μC is at x = 2.00m and

the positive charge q2 = 6.00μC is at the origin. Where must a negative charge q3 be placed on

the x-axis such that the resultant force on it is zero?

A satellite orbiting the Earth at 400 km above the surface of the Earth has a 2 m long antenna oriented perpendicular to the Earth's surface. At the equator the Earth's magnetic field is 8×10−5 T and is horizontal. Assuming the orbit to the circular, find emf induced across the ends of the antenna.(Given radius of earth Re ​=6400 Km)

A compact fluorescent lamp (CFL) uses less energy than its equivalent incandescent bulb. How much will a person save if he/she uses a 20 W CFL instead of a 100 W incandescent lamp for 6 hours in 30 days? Electricity is priced at ₱ 8.17/kW.h.

Illustration and solution required- please use the dorsal portion.

12-14. Two like charges of charge +10 nC are placed at the two corners of an equilateral triangle of sice 3cm. What is the magnitude of the total potential at the third corner?

15-17. A point charge q = 2.00μC is located at the origin. Find the electric potential due to this charge at point x = 4.0 m.

How does an electric field and magnetic field affect the kinetic energy of a charged particle moving in free space?

1. A series circuit consisting of 3 resistors R₁ = 8.0Ω, R₂ = 12.0Ω, and R₃ = 4.0Ω is connected to a 24.0 V terminal voltage. a. Calculate the equivalent resistance, b. Calculate the current through each resistor, c. Calculate the potential drop across each resistor.
2. Three resistors are connected in parallel, R₁ = 2.0Ω, R₂ = 5.0Ω, and R₃ = 10.0Ω attached to a 1.25V voltage source. a. Calculate the equivalent resistance, b. Calculate the current supplied by the source to the parallel circuit, c. Calculate the current in each resistor.

A small 10 mm diameter permanent magnet produces a field of 100 mT. The field drops away rapidly with

distance and is negligible more than 1 mm from the surface. If this magnet moves at a speed of 1 m/s through a 100-turn coil of length 1 mm and diameter just larger than the magnet, what is the EMF induced?

A coil of wire of 20 turns has across sectional area of 0.1 m2. A magnetic field of 0.5T passes through the coil

parallel to the plane of the coil. What is the total magnetic flux through the coil?

Two point charges are placed as follows: charge q1 = -1.50 nC is at y = +6.00 m and charge q2 = +3.20 nC is at the origin. What is the total force (magnitude and direction) exerted by these two charges on a negative point charge q3 = -5.00 nC located at (2.00 m, -4.00 m)?

A very large, superconducting solenoid such as one used in MRI scans, stores 1.00 MJ of energy in its magnetic field when 100 A flows. (a) Find its self-inductance. (b) If the coils

“go normal,” they gain resistance and start to dissipate thermal energy. What temperature increase is produced if all the stored energy goes into heating the 1000 kg magnet,

given its average specific heat is 200 J/kg·oC ?