Electricity and Magnetism Answers

A rectangular coil of 70 cm length , 10 cm width consists of 9 turns and carries 0.1 amperes current is hanged to a scale pan ehere its length is in a vertical position and lower part is perpendicular to a uniforn magnetic field so balance is obtained . When the current is reversed it's needed to add 8.78 grams to the other side to restore balance again find the magnetic flux denisty given that g= 10 m/s^2

An energy of 5.35eV is stored by a molecule undergoing a circulatory motion with an angular momentum of 0.5kgm²s-¹, determine its moment of inertia.

A Plane travelling towards west at speed of 1800 km/hour.what is the voltage difference developed between the ends of wings having a span of 25 meter, if the earth magnetic field at the location has a magnitude of 5×10^2 T and the dip agle is 30°

What exactly is a charge?

Two charges separated by 1 m exert a 1.0-N force on each other. If the charges are pushed to 0..50-m separation, what will be the force on each charge?

Aconducting sphere of radius 10 /cm has an unknown charge.if the electric fild 15 /cm from the center of the sphere has the magnitude 3.0*10000 N/C andisdirected radially inward ,what is the net charge on thesphere?

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.