Electricity and Magnetism Answers

What will be resistivity of a metal wire of 2m length and 0.6 mm in diameter, if the resistance of the wire is 50

Is 1 Henry (1H) equivalent to

J.s/A²=J/C . S/A=J×S/C×1/A=J×1/ C/S=1/A=J.S/A²

L=V.sec/A

The back e.m.f induced in coil when electric charges from 1A to zero in millisecond is 4 volt. Find the self induction n(L) of coil.

A proton beam is moving vertically downward. It passes through a magnetic field directed horizontally from south to north. The beam is directed toward:

1- east 2- west 3- north 4- south

The north pole is away from a metallic ring lying horizontally. The direction of current is:

1- anti clock wise 2- clock wise

3- no current induced

If a vector field A(x,y,z)=xz3ex - 2x2yzey+2yz4ez , calculate the divergence Ñ·A at point M(1,-1,-1).

1) If a scalar field φ(x,y,z)=3x2y-y3z2, calculate the gradient Ñφ at point M(1,-2,1).

Define and explain hall's effect and hall's effect in semi-conductor. Derive the magnitude of hall's voltage. What is the use of hall's effect?

State and explain Lenz's law the lenz's law is also a statement of law of conservation of energy. Explain, does the lenz's law violate the principle of law of conservation of energy.

What are Maxwell’s four integral equations