Electricity and Magnetism Answers

A magnetic field exerts a force of 8.0 x 10^–14 N toward the west on a proton moving vertically upward at a speed of 5.0 x 10^6 m/s. When moving straight in a northerly direction, the force on the proton is zero. Determine the magnitude and direction of the magnetic field B in this region. (The charge of a proton = 1.6 x 10-19 C, the north direction is into the page.).

An electron moves with an energy of 6.0×10^-16J across a magnetic field of 4.0×10^-3T perpendicularly. Calculate the velocity of electron, force on the electron,orbital radius of the electron and the period of motion.

(a) A straight conducting wire is placed perpendicularly to the earth

magnetic field at a location. The earth magnetic field at the location has a

magnitude of 0.450 G. Determine the current that must flow in the wire for a

9.50 cm length of the wire to experience a magnetic force of 1.50 N due to the

earth magnetic field.

[1 T = 104 G]

(b) A wire of length 1.0 m carries a current of 1.0 A. The wire is formed into a

circular coil and the circular coil has one turn only. Determine the magnitude of

the maximum torque which is developed on the coil if it is placed in magnetic

field of 2.0 T.

You havpossible e five 10F capacitors.Show all the possible connections for the five capacitors to produce a total capacitance of 50.0F?

The relative permittivity of a dielectric is 2.25

a) what is its permittivity?

b)What will be the capacitance if its dielectric is inserted into 7.8 uFair capacitor?

The parallel plates of an air capacitor are separated by 2.25 mm.Each plate carries a charge of 6.50nC.The manitude of the electric field of the plates is 4.74x10^5V/m.Find the a) potential difference between he plates

b) capacitance and

c)area of the plate.

Two charges, -8 C and -4C are positioned 10 meters from each other. What does the -8C feel as a result of the -4C? 

3. If there were twice as much as charge on one of the charged objects near the charge sphere, would the electric potential energy of the object in the field of the charged sphere be the same or would it be twice s great? Would the electric potential of the object be the same or would it be twice as great?

2. Four charges. g_{x} = 5.00 * 10 degrees * C q-3.00 x C. q 3 =-2.00*10^ C,q 3 =6.00*10^ C, are situated at the corners of a square of side 4.00m. Find the potential at the center of the square?

The free electrons in a metal are gravitationally attracted toward the earth. Why, then, don’t they all settle to the bottom of the conductor, like sediment settling to the bottom of a river?