Electricity and Magnetism Answers

If a compass is placed at east direction of a magnetic field.In which direction will the compass needle point to?

A bar magnet has poles of strength 40 Am, the poles being 13 cm apart. Find the magnetic induction at a point which is 12 cm from the N-pole and 5 cm from the S-pole.

Suddenly uniform magnetic field B₀ (-k) is applied in the circular gravity free region having radius 4a. Initially field was zero and charge (q, m) was at rest at (a, 0). Now once field is setup find the radius, of circular path (in meter) Given : a = 4.00 m. 

In the answer E.2(pi)a = B.(pi)a² is taken. imagining a circle with centre origin. My question is why not take any arbitrary circle with an arbitrary centre which pases through (a,0)

What is the index of refraction of a medium in which light travels at 1.89x10^8m/s

the interaction between the magnetic fields produced by the magnet and the current in the wire produces forces on the magnet and wire. Compare these two factors

if the number of turns becomes double but the length remain same then magnetic field in the solenoid becomes???

Find the volume charge density associated with a field given by D = (xy²)i + (yx²)j + (z)k C/m²

Test instrument to measure magnetic field strengths are often based on the Hall Effect. In one instrument the “probe” is a 1.0-mm- thick, 6.0-mm - wide semiconductor with a charge-carrier density of 2.1x 1021 m^-3 , much less than the charge-carrier density in a conductor.

Passing a 60 mA current through the probe generates a Hall voltage of 120 mV. What is the magnetic field strength?

An infinite solenoid (n turns per unit length, current I ) is filled with linear material of susceptibility χm. Find the magnetic field inside the solenoid.

A proton travels at 1.2x10^7 m/s in a plane perpendicular to a uniform 0.020T magnetic field. Give a quantitativ description of its path