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A tightly-wound, long solenoid having 50 turns/cm, carries a current of 4.00 A. Find the magnetic
intensity H and the magnetic field B at the centre of the solenoid.
Describe the hysteresis loop and compare the hysteresis loop for a soft iron and steel
What does cylindrically symmetric charge distribution mean? Use Gauss’s law to determine the electric field of an infinite solid cylinder of radius R having volume charge density(rho) at a point outside it.
A copper wire has a resistance of 15.0 ohms at a temperature of 14 C. After a current passes through the windings, the resistance rose to 125 ohms. To what temperature was the wire heated?
Wires A and B are made of the same material and have the same length. However, the diameter of wire A is thrice the diameter of wire B. Wire A has a resistance of 12.0 ohms. What is the resistance of wire B?
If a charge of magnitude 7.5 x 10-17 C is being held in place 2 x 10-8 m
from a charge of -9.0 x 10-19C which is also being held in place, what is the electric
potential energy of the system?
Three point charges are arranged on a line. Charge q3 = +5.00 nC and is at the origin.
Charge q2 = -3.00 nC and is at x = +4.00 cm. Charge q1 is at x = +2.00 cm. What is q1
(magnitude and sign) if the net force on q3 is zero?
Vt= 220v
R1= 10 ohms
3 parallel resistor:
R2= 5 ohms
R3= 2 ohms
R4= 4 ohms
R5= 5 ohms
- Total Resistance
- Total Current
- Total Power
- Current 1 to 5
- Voltage 1 to 5
- Power 1 to 5
Consider four positive charges with charge Q arranged in a square with side-length d, centred about the origin in the x − y plane. (a) Sketch the electric field of the charge configuration, using field lines. Describe how you constructed your sketch, and list some key features of charges and electric field lines that your sketch demonstrates. (b) Derive an expression for the electric potential V (x, y) in the x − y plane (c) Describe, using concepts and terminology used in PHYS1002, the difference between electric potential and potential energy. (d) Derive an expression for the potential energy U of the charge configuration, and show that it is given by U = (4 + √ 2) 4π0 Q2 d . (e) The charges are all released simultaneously from rest, and accelerate away from each other due to Coulomb repulsion. If Q = 22.4 µC, d = 1.50 mm and the mass of each is 1.00 g, calculate their speed when they are very far apart. Include appropriate significant figures in your answer.
An electron moves at 2.50 X 10^6 m/s through a region in which there is a magnetic field of unspecified direction and magnitude 7.40 X 10^-2 T. (a) what are the largest and smallest possible magnitudes of the velocity of the electron due to the magnetic field? (b) if the actual acceleration of the electron is one-fourth of the largest magnitude in part (a), what is the angle between the electron velocity and the magnetic field?
