Electricity and Magnetism Answers

A current of 5.75 A flows in the coil of wire from an applied voltage of 120 V. The motor operating at normal speed creates a back EMF of 32.0 V. What is the resistance of the coil?

A circular loop of 80 turns with radius 15.0 cm is perpendicular to a magnetic field of 0.52 T. How much induced voltage is created if it is rotated in 0.20 s so that its face is parallel to the field?

A 50-turn coil has a resistance 2.5 Ω. If it is enclosed in an area of 25 cm2, what would be the rate of change of a magnetic field parallel to its axis to induce a current of 0.5 A in the coil?

. A motor with coil of area 3cm^2 rotes with uniform angular velocity w in the magnetic field changing at 200 T per minute. A) make a graphical representation of induced EMF; b) find such w.

What are the magnitude and direction of the electric field that will balance the

weight of (a) an electron and (b) a proton?

A boy of mass 40kg runs up a flight of 30steps each step is 150mm in 6s.Find the average power developed by the boy.(g=10ms²)

Two fixed charges 1.07 micro Coulomb and -3.29micro Coulomb are 61.8cm apart where may a third charge be located so that no net force act on it?

need better explantion please

The electric field vector E and the magnetic field vector H in

free space are given by £ = 50/p cos(10^6 t + /Bz) a V/m and

H =Ho/p cos( 10^6 t+Bz) ap A/m. Determine their respective

phasor forms and the constants Band Ho such that the fields

satisfy MaxwelJ's equations

1. A proton (q=+5x10^-19C) is injected from right to left into a field B of 0.5 T directed toward the upper side of a sheet of paper. If the velocity of the proton is of 4x10⁶m/s, find the magnitude and direction of the magnetic force over the proton.

a dynamo delivers 30.0 a at 120 v to an external circuit when operating at 1200 rpm. what torque is required to drive the generator at this speed if the total power losses are 400 W?e