Electricity and Magnetism Answers

1.How do insulator such as wearing rubber shoes reduce electrical damage to the human body?

2. Why does the production of sparks (current in air) in an explosive or flammable atmosphere should be prevented?

3. What might happen to a personif he/she approaches and reaches out for an object that is grounded if excess charge has accumulated on the person?

A train moves from an observer standing on a platform with a velocity of 10m/s. The siren emitted by the Train has a frequency of 50Hz.

A. What is the frequency of the sound heard by the observer?

B. What is the frequency of the sound heard by the observer in the Train?

(SPEED OF SOUND = 330 PER SECONDS)

A source of sound moves towards a stationary observer with a speed of ⅓ that of sound. If the frequency of the sound from the source is 100Hz, what is the apparent frequency of the sound heard by the observer

In a nucleus, two protons are 10^-15 m apart. a) What is their electrical potential energy? b) Knowing that they start from rest and are free to move, find their velocity when they are 4x10^-15 m apart.

What is the force in an electric field of 200 N/C?

What is the force on na electron in an electric field of 200 N/C?

Three point charges 10 C, -20 C, and -50 C are at the three consecutive corners of a square 10 cm on a side. What is the potential energy of the system?

A square coil RSTU of sides 5.0 cm carrying a current, I of 2.5 A is placed in a uniform magnetic field, B of 2.4 T.Calculate the torque on the coil.

Two long parallel wires, 12.0 cm apart are carrying current 1.8 A and 3.5 A respectively in the same directions. The magnetic field at the midpoint between both wires is 5.0 X 10^-8 T out of the page. If a proton moves with a velocity of 2.8 X 10⁵ m s-1 at the midpoint between the wires, determine the magnetic force acting on the proton.

Aircraft sometimes acquire small static charges. Suppose a supersonic jet has a 0.60 µC charge and flies 30ᵒ north of west at a speed of 660 m s-1 over the Earth’s south magnetic pole, where the 8.00 X 10-5 T magnetic field points straight up. Determine the magnetic force on the supersonic jet.