Electricity and Magnetism Answers

 Calculate the strength of an electric field 1.2 m away from a point charge of 7.4 x 10-5C.

Calculate the magnitude of force that would act on an object carrying a charge of 3.2 x 10-5C if it was placed in a magnetic field with a strength 4.27 x 104 N/C.

A square coil (0.40 m²) of wire consists of 70 loops. The magnetic field is perpendicular

to the face of the coil and decreases at a rate of 0.025 T/s. What is the magnitude of

the induced electromotive force in the loop?

A circular coil with 100 turns and a radius of 0.10 m is placed in a uniform magnetic

field so that it is perpendicular to the plane of the coil. The field changes uniformly

from zero to 0.4T in 2 seconds. Calculate the induced emf.

not exceeding 25V when it is connected to the main power supply a step-down transformer with 50 turns in the primary coil is used.Calculate the number of turns in the secondary coil when the voltage of the main power supply is 112V.

An electrical appliance works with a voltage not exceeding 25V when it is connected to the main power supply a step-down transformer with 50 turns in the primary coil is used.Calculate the number of turns in the secondary coil when the voltage of the main power supply is 220V.

Draw me a simple diagram of a step down transformer showing the core,primary winding and the secondary winding.

A simple diagram of a step down transformer showing the core ,primary winding and secondary winding

Determine the force between two positively charged particles that are separated by a distance of 3.71cm and that have charges of 1.4 x 10-5C and 3.2 x 10-5C.

 A small plastic sphere is charged to -10 nC. It is held 1.0 cm above a small glass bead at rest on a table. The bead has a mass of 15 mg and a charge of +10 nC. Will the glass bead “leap up” to the plastic sphere?