Electricity and Magnetism Answers

Two metal spheres of identical mass
m = 3.20 g
are suspended by light strings 0.500 m in length. The left-hand sphere carries a charge of
0.785 µC,
and the right-hand sphere carries a charge of
1.51 µC.
What is the equilibrium separation between the centers of the two spheres?

A charge particle moves through a region of uniform magnetic field. Is the momentum of the field affectd?

When a balloon is rub with a shirt then both the objects become charged,leaving the balloon negatively charged.
a). is it mean that elecrons has been transfered to balloon?
b). if yes then is it means we have removed the electrons from the shirt i.e we ionized the atoms?
c) if NO then what is going on there?

6. a) Explain how the choice of intermediate frequency (IF) in radio communication is a
compromise.

3. a) Explain the difference between analog bandwidth and digital bandwidth in
communication systems.

I=√2sin(100πt-π⁄2),find frequency?

in an electric feild the potential at a point is given by following relation: V=343/r.
the electric feild at r=3i+2j+6k is

) A uniform plane wave of 100 kHz travelling in free space strikes a large block of a
material having 4 , 9 and 0 ε = ε0 µ = µ0 σ = normal to the surface. If the incident
magnetic field vector is given by
10 cos( ) ˆ tesla 6 B = ωt −βy z
−
r
write the complete expressions for the incident, reflected, and transmitted field
vectors.

a stiff metal rod kept over two knife edges of length 1m. rod carries current of 16A. and rolls over rails without slipping due to uniform magnetic field of 0.5T perpendicular pointing downwards. rod starts from rest and attains speed of K/root5 when leaves rails. find value of K

Long problem #1: Three wires carrying a 1.0-A current in the same direction. The wires are at the corners of an equilateral triangle of side s=1.0m. What is the magnetic field (magnitude and direction) at the center of the triangle?