Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 2, Problem 2RQ
What determines the strength of the magnetic field when current flows through a conductor?
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Question B4
a) The strength of the magnetic field B at a distance r from a straight conductor car-
is the permeability
rying a current I is given by the expression B =
of free space with the value 4n × 10-7 NA-2. Two long straight wires are lined
up parallel to one another at a separation of 0.2 m. Currents of 4 A and 2 A flow
through the wires, both in the same direction. Calculate the value of the magnetic
field strength due to the two wires at a point P on the mid-plane between them.
where
2r
b) Calculate period of a small satellite which is making a circular orbit just outside a
planet of density 4.0 × 10³ kg/m³. Provide the answer in SI units and in hours. Use
the value of the universal gravitational constant 6.7 x 10-11 N kg-2m-2.
c) A mass of 0.01 kg is suspended from a light spring of natural length 80 mm and
causes the spring to extend by 10 mm. The mass is pulled down a further 5 mm
and then released. Assuming g = 9.8 m/s², calculate:
i) the spring constant.
ii) the period of…
With the aid of diagram Define an electromagnet?
Explain with the aid of diagram how electromagnetisms work?
Explain with the aid of diagram what do you mean by right hand rule?
Give some strength of electromagnetic fields.
What do you mean by electromagnetic induction?
Explain with the aid of diagram what is an electromagnetic wave?
State the applications of electromagnetism.
A 7.45m wire carries a current of 76.76mA perpendicular to a uniform magnetic field of magnitude 2.17T. What is the magnitude of the force the wire experiences due to the presence of the magnetic field?
Chapter 2 Solutions
Electrical Transformers and Rotating Machines
Ch. 2 - What determines the polarity of magnetism when...Ch. 2 - What determines the strength of the magnetic field...Ch. 2 - Prob. 3RQCh. 2 - How many lines of magnetic flux must be cut in 1 s...Ch. 2 - Prob. 5RQCh. 2 - Into how many time constants is an exponential...Ch. 2 - Each time constant of an exponential curve is...Ch. 2 - An inductor has an inductance of 0.025 H and a...Ch. 2 - Prob. 9RQCh. 2 - What electronic component is often used to prevent...
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- What determines the polarity of magnetism when current flows through a conductor?arrow_forwardDefine the following terms: Flux density Permeability Reluctance Saturation Coercive force Residual magnetismarrow_forwardThe south pole of one magnet is brought close to the south pole of another magnet. Will the magnets repel or attract each other?arrow_forward
- How can the polarity of an electromagnet be determined if the direction of current flow is known?arrow_forwardQuestion 2 Calculate the amount of DC current required for the magnetic circuit given below to generate a flux density of 1.0 T in the airgap. The details are Number of turns, N = 400 The core is made up of steel, the B-H characteristic has been given below The magnetic core length, le = 500 mm The airgap length, Ig = 2 mm The cross-sectional area of the core, Ag = 100 mm² Neglect leakage and fringing. Core Cross-sectional i(1) area as Air gap Magnetic path length Figure 1 2.0 1.8 B-H Curves for Various Metals Steel 1.6 1.4 Magnetic Saturation 1.2 1.0 0.8 Iron 근 0.4 Air 0.2 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 Magnetic Field Strength - H (A/m) Figure 2 Flux Density - B (T)arrow_forwardAnswer #1 with diagramarrow_forward
- 令all Answer by true or false * True False The magnetic saturation means the domains of iron crystal arranged in multi directions with respect to field. Answer by true or false * True False D.C shunt generators are most suitable for arc winding Page 2 of 2arrow_forwardNow pleasearrow_forwardWhich of the following is not the unit for electrical conductivity? Select one: O (0-m) - 1 O N-m O (N-mm) -1 O S/marrow_forward
- The current in a component is reduced uniformly from 100mA to 20mA over a period of 8.0s.What is the charge that flows during this time? Оа. O a. 480 mC O b. 640 mC Ос. 320 mC O d. 160 mCarrow_forwardASAParrow_forwardTrue or False? The strength of the magnetic field in an electromagnet increases with an increase in the number of turns of wire and the current flowing through them.arrow_forward
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