Electricity and Magnetism Answers

 Two charged particles apply an electric force of 5.2×10 −3 N on each other. Distance between them gets twice as much as before. What will be Coulomb's force?

a) A wire loop of resistance 20 Omega and radius 5.0cm is kept in the plane of this paper in a changing uniform magnetic field vec B .The direction of vec B is perpendicular to the plane of the page and points out of it.If the magnitude of the induced current in the loop is 3.0mA determine the rate of change of the magnitude of the magnetic field bar(B) .

 Calculate the magnitudes of magnetic intensity vector H and magnetic field vector B at the

centre of a 2500-turn solenoid which is 0.50 m long and carries a current of 1.0 A.

(u_o= 4π x 10^-7Hm^-1)

A particular hydrogen atom is in an energy state with E = –2.418×10^-19 J. Calculate the maximum angular momentum this atom could have.

Give the value as a multiple of ℏ to 2 decimal places. (e.g. if you calculated L = 1.41ℏ, then you would enter "1.41" as your value).

Calculate the electric force between charges of 2.5 nC and 6 x 10^8C if they are 8.0 cm apart.

Positive charge Q is distributed uniformly along the y-axis between y = -a and y = +a. Find the electric field at point P on the x-axis at a distance x from the origin.

An electromagnetic wave is generated by

A wire loop is hung from a pendulum and it swings through a

magnetic field as shown from a to d.

a) As the pendulum swings from a to b, the right hand side of the loop

enters the field. Use the right hand rule to determine the direction of

the induced current.

b) As the pendulum swings from c to d, the right hand side has left the

field and the left side is still moving through the field. Use the right

hand rule to determine the direction of the induced current.

c) While the pendulum swings from b to c, the entire loop is in the field and both the right

side of the loop and the left side of the loop are moving through the field. Use the right

hand rule to justify the lack of induced current.

A wire of length 150cm carrying an electric current of 0.1A in the negative x direction and perpendicular to a magnetic field B, experiences a force of 6.0 * 10^-3 N in the positive y direction due to a magnetic field. Find:

A. The magnitude of the magnetic field.

B. Direction of the magnetic field.

the pitch of a flute when played while holes are opened one by one becomes different from the pitch when all holes are closed. why?