Electricity and Magnetism Answers

A 10 g bullet having a charge of 4.oo micro coulomb is fired at a speed of 270m/s in a horizontal direction. A vertical magnetic field of 500micro Tesla exist in the space . Find the deflection of the bullet due to the magnetic field as it travels through 100m . (1) 3.7 /10000 m (2) 3.7 /100000 m (3) 3.7/1000000 m (4)3.7/10000000 m

1. In the Ampere-Maxwell’s equation, is it possible that both a conduction current and a
displacement are non-vanishing?

2. What causes electromagnetic radiation?

3. When you touch the indoor antenna on a TV, the reception usually improves. Why?

4. Explain why the reception for cellular phones often becomes poor when used inside a
steel-framed building.

5. Compare sound waves with electromagnetic waves.

An electron of mass 0.90×10 power -30 kg under the action of a magnetic force moves in a circle of 2.0 cm radius at a speed of 3.0×10 power 6m/sec . if proton of mass 1.8×10 power -27 kg were to move in circle of the same radius and if it were acted upon by the same magnetic field then its speed will be (1)3.0×10 power 6 m/sec (2) 1.5× 10 power 3m/sec (3) 6×10 power 4m/sec (4) can not be estimated from given data

Two parallel long wire carry i1 and i2 with i1 >i2 . When the current are in the same direction , the magnetic field at a point midway between the wires is 10 micro T. If the direction of i2 is reversed ,the field becomes 3micro T . The ratio of i1/i2 is (1)4. (2)3 (3)2. (4)1

Two parallel long wire carry i1 and i2 with i1 >i2 . When the current are in the same direction , the magnetic field at a point midway between the wires is 10 micro T. If the direction of i2 is reversed ,the field becomes 3micro T . The ratio of i1/i2 is (1)4. (2)3 (3)2. (4)1

An electron is moving in a uniform magnetic field B in a circular orbit of radius r. Suddenly the field is reduced to B/2.The radius of the path now becomes (1)2r (2)r/2 (3)r (4)4r

A long, straight wire of radius 5.0 mm carries a current of 20A. i) Calculate the
magnetic field at the surface of the wire, and ii) calculate the perpendicular distance,
from the axis of the wire, at which the magnitude of magnetic field will be half of
its value at the wire surface.

Using Maxwell’s equations in free space, derive the wave equation for the
electric field vector. Obtain the conditions under which the following time varying
electric and magnetic fields satisfy Maxwell’s equations in vacuum with no source
charges or currents:
sin ( )
ˆ
0 E = k E y − vt
) sin (
ˆ
0 B = i B y − vt
where E0 and B0 are constant.