Electricity and Magnetism Answers

A solenoid coil.has 10^4 turns of fine insulated conducting wire. The main cross sectional area of the coil is 4000m^2. The magnetic field through the coil changes at a uniform rate of 0.8T to -0.4T in a time of 3s. If the circuit resistance of the coil is 12ohms. Calculate (1).the charge made to pass a cross section of the circuit. (2).the average current (3).the instantaneous current when the magnetic field is zero

Find magnitude of charge passing through coil when area is 5*10^3m^2, number of turns is 10, and resistance is 10ohms with its plane at right angles to a uniform magnetic field B = 0.08T

Define and state the SI Unit of:
Electric field intensity
Calculate the magnitude of the electric field strength at a point 5 10 from an electron which is in a vacuum.

Two charges are attracted by a force of 25 when separated by 10 . What is the force
between the charges when the distance between them is 50 ?

A charged mass of 0.1g is placed inside an electrical field of 9.8 × 10^5 N/C.
Ifthe mass is in equilibrium, then what is the charge of the mass?

2A current is passed along the diameter AB of a circular loop. Find the
magnetic field at the center O of the loop. Radius of the loop is 2cm . pls explain
And what theory should i learn more about it.

1. A proton is located at y=0.06m and has a velocity of 5x106 m/s in the +x direction while an electron is located at x=0.08m and has a velocity of 7x106 m/s in the +y direction. What is the magnetic field generated by these two charges at the origin (magnitude and direction)?

A 2m long fixed string nodes at both ends when it vibrates in its fundamental mode if the distance between this nodes is 12m.what are nunber of (a) nodes (b)anti-nodes?

A cube of sides length L contains a flat square plate also with sides of length L. The cube and square are in a Cartesian coordinate system. The square is placed at z=L/2 and extends from x=0 to x=L and from y=0 to y=L. The cube is placed such that it extends from x=0 to x=L, y=0 to y=L and z=0 to z=L. The flat square plate has a surface charge density that is given by -3xy (C/m2). Calculate the total electric flux passing through the sides of the cube.

A current of I Ampere flows in a circular arc of wire which subtends an angle of 3π/2 radians at it's center, whose radius is R. The magnetic induction B at the centre is?