[طموحي عالم]

Electricity and magnetism
Q1/
A: find the electric field due to electric dipole?

B: by using gausses theory. Find the electric field due to charged sheet?

C: find the relation between the current and the velocity of charge?


Q2/
A: determine the equivalent capacitance for the capacitor network shown in figure. If the network is connected to a 12-V battery, calculate the potential difference across each capacitor and the charge on each capacitor?
3MF 6MF


2MF

B: find the capacitance of cylindrical capacitor?

C: state that: coulombs law, kirchhoffs laws and define one farad?

Q3/
A: A bar of magnet is placed along magnetic meridian with its south pole pointing towards the geographical north? Sketch the magnetic field?

B: discuss the main properties of baea-dia-and ferro magnetic materials?

C: a long straight wire carries of 4A. what is the magnetic field at a point distance 10cm from the wire?


Q4/
A: a straight solenoid has 400 turns wound on a cylinder of radius 5cm and length 40 cm. what is the magnetic field at the mid-point of solenoid when a current of 2A flows in it?

B: use amperes law to find the magnetic field at center of long solenoid. The solenoid has n turns of wire per unit length and carries a current i?

C: obtain an expression for the magnetic intensity at a point on the bisector of a bar of magnet?
2/1/2011
Q1/
A: define each of the following: coulombs law, the electron volt and the capacity of a capacitor?

B: by using gausses theory find the electric field due to a plan sheet of charge?

C: an object with a net charge of 24 MC is placed in a uniform electric field of 610 N/C, directed vertically. What is the mass of the object if it (floats) in the electric field (g=9.8m/sec^2)?
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Q2/
A: find the capacity of parallel plate capacitor?

B: by using biot-savarts law: find the magnetic field density due to circular ciol?

C: explain the mass spectrometer?


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