Electricity and Magnetism Answers

Two neutral objects are rubbed against each other with the aim of facilitating charging by friction Which of the

following are valid possibilities?

a. One object lost 58 electrons and the other last 58 protons

b. Both objects lost 58 electrons

c. One object gained 58 electrons and the other gained 58 protons

d. One object gained 58 electrons and the other lost 58 electrons

e. Both objects gained 58 protons

f. Both objects lost 58 protons

g. One object gained 58 protons and the other lost 58 protons

h. Both objects gained 58 electrons

A circular iron ring of mean diameter 25 cm and cross-sectional area 9 𝑐𝑚2 is wound with a coil of 100 turns and carries a current of 1.5 A. The relative permeability of iron is 2000. Calculate the amount of flux produced in the ring

The magnetic flux density between the poles of a powerful electromagnetic force is 2.0 Tesla. A wire of length 2.0x10-²m. carrying a current of 4 ampere is placed in the given field. Calculate -

I. The maximum force on the wire.

II. Force when the wire meet at an angle of 45°

III. Force when the wire is parallel to the field.

the force on a charge moving with velocity (v) in a magnetic field (B) half of a maximum force.

Calculate the angle between V and B. F=qvB

(1) A student claims that capacitors in parallel combinations have greater

equivalent capacitance compared to the magnitude of either the capacitor and

less than either the capacitors when connected in series combination. How will

you agree or disagree with the claim?

two charged particle q1=10uC and q2=20uC are separated by distance r=15cm.what is the magnitude of the electrostatic force with solution.

a force of 500N exist between two identical points charge separate by a distance of 40cm.calculate the magnitude of the two point charge with solution.

the electronic force between two-points charge with a magnitude of-800nC and is 15N.how far apart are the two charges from each other in centimeters? with solution.

1. 2 charged particles reacted with a force of 0.31 N with a distance of 1.5 cm, the 2nd charge contains 54 nC. Find the value of the first charge.

2. Using eq. 2, solve for the Force of 2 charges, q1 = -63 nC and q2 = +42 nC with a distance of 5.5 cm. (Note: ϵ0 has a value of 8.85 x 10⁻¹² F/m) (F= N m/ C²)

3. Find the charge of a test charge with an electric field of 6.0 x 10⁻⁶ N/C and a force of 0.25 N

4. Solve for the Electric field of a point charge q, with a value of 2.9 nC and a distance of of 2.4 m

5. Find the value of the point charge with an electric field of 12 N/C and a distance 3.3 m

A point charge q1=4.00 nC is placed at the origin, and a second point charge q2=-3.00 nC is

placed on the x-axis at x=+20.0 cm. A third point charge q3=2.00 nC is to be placed on the

x-axis between q1 and q2. Let the potential energy of the three charges be zero when they

are infinitely far apart.

a) what is the potential energy of the system of the three charges if q3 is placed at x=+10.0

cm?

b) where should q3 be placed to make the potential energy of the system equal to zero?