Recent questions tagged field

asked May 27, 2020 by anonymous

Why does the magnetic field flow from north to south?

0 like 0 dislike

30 views 0 answers

asked May 7, 2020 by anonymous

State advantages of rotating field type alternators.

Last answer: Advantages of Rotating Field Type Alternator: 1) For high-voltage alternator, large space is required to accommodate conductors with insulation, as high voltage is induced in them. If field poles are placed ... is kept rotating. 8) Rotating field is comparatively light and can run with high speed.

0 like 0 dislike

59 views 1 answer

asked Mar 30, 2020 by anonymous

A magnetic circuit has effective iron length of 100 cm and it is wound with 800 turns of wire carries 1 A. Find the magnetic field strength.

Last answer: magnetic field strength

0 like 0 dislike

156 views 1 answer

asked Jun 29, 2019 by anonymous

Briefly describe the electric field of a static charge.

0 like 0 dislike

61 views 0 answers

asked Jun 11, 2019 by anonymous

Field intensity formula

Last answer: Field intensity formula

0 like 0 dislike

42 views 1 answer

asked Jun 11, 2019 by anonymous

Energy stored in electrostatic field of capacitance formula

Last answer: Energy stored in electrostatic field of capacitance formula

0 like 0 dislike

58 views 1 answer

asked Sep 6, 2018 by anonymous

What arc the errors occurring in measuring devices due to stray magnetic field and temp '? Explain how to compensate them.

Last answer: 1. Error due to stray magnetic fields- Main magnetic field gets disturbed by external magnetic fields known as stray magnetic fields. 2. Compensation technique To avoid this error, ... resistance alloy having a negligible resistance temp coefficient in the ratio of 1:10 for pressure coil

0 like 0 dislike

59 views 1 answer

asked Sep 5, 2018 by anonymous

Define junction field effect transistor (JFET) and give an example.

Last answer: Junction Field-Effect Transistor: It is a semiconductor device having three terminals, namely Gate, Drain and Source, in which the current flow is controlled by an electric field set up by an external voltage applied ... : i) n-channel JFET and ii) p-channel JFET Examples of JFET: BFW 10, BFW 11

0 like 0 dislike

145 views 1 answer

asked Sep 4, 2018 by anonymous

Derive an expression for energy stored in a magnetic field .

Last answer: Expression for energy stored in a magnetic field: The energy is stored in magnetic field when current increases and return back when the current decreases. At instant t' seconds after closer of switch ... energy absorbed by the magnetic field when current increases from 0 to I amperes

0 like 0 dislike

121 views 1 answer

asked Aug 8, 2018 by anonymous

Give the relation between magnetic field strength, magnetic flux density and permeability.

0 like 0 dislike

63 views 0 answers

asked Aug 8, 2018 by anonymous

Define magnetic field strength and state its unit.

Last answer: Magnetic field strength is the force experienced by a unit N-pole when placed at any point in a magnetic field is known as magnetic field strength or magnetizing force. Magnetising force or magnetic field ... unit of length is metre. So the unit of magnetic field strength is ampere turns per metre.

0 like 0 dislike

77 views 1 answer

asked May 1, 2018 by anonymous

In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation,

In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as (1) synchronous motor (2) synchronous generator (3) asynchronous motor (4) asynchronous generator

Last answer: In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as synchronous generator

0 like 0 dislike

315 views 1 answer

asked Apr 29, 2018 by anonymous

The ability of materials to become polarized under an applied electric field is called _______

The ability of materials to become polarized under an applied electric field is called _______ A) Ferroelectricity B) Paraelectricity C) Polectricity D) None of these

Last answer: The ability of materials to become polarized under an applied electric field is called Paraelectricity

0 like 0 dislike

93 views 1 answer

asked Apr 29, 2018 by anonymous

Which of the following laws relates the magnetic field to the magnitude, direction, length, and proximity

Which of the following laws relates the magnetic field to the magnitude, direction, length, and proximity of the electric current? A) Lenz’s law B) Faraday’s law C) Biot–Savart law D) None of these

Last answer: Which of the following laws relates the magnetic field to the magnitude, direction, length, and proximity of the electric current? A) Lenz’s law B) Faraday’s law C) Biot–Savart law D) None of these

0 like 0 dislike

62 views 1 answer

asked Apr 29, 2018 by anonymous

The electric field inside a hollow conducting sphere ________

The electric field inside a hollow conducting sphere ________ A) Depends on the diameter of the sphere B) Varies according to the direction of earth’s magnetic poles C) Is zero D) None of these

Last answer: The electric field inside a hollow conducting sphere Is zero

0 like 0 dislike

104 views 1 answer

asked Apr 28, 2018 by anonymous

Which of the following statements is not characteristic of a static magnetic field?

Which of the following statements is not characteristic of a static magnetic field? (A) It is solenoidal. (B) It is conservative. (C) It has no sinks or sources. (D) Flux lines are always closed.

Last answer: Which of the following statements is not characteristic of a static magnetic field? (A) It is solenoidal. (B) It is conservative. (C) It has no sinks or sources. (D) Flux lines are always closed.

0 like 0 dislike

1.3k views 1 answer

asked Mar 26, 2018 by anonymous

It is possible to increase the field flux and, at the same time, increase the speed...

It is possible to increase the field flux and, at the same time, increase the speed of a d.c. motor provided its .......... is held constant.

Last answer: It is possible to increase the field flux and, at the same time, increase the speed of a d.c. motor provided its armature current is held constant.

0 like 0 dislike

68 views 1 answer

asked Mar 25, 2018 by anonymous

A field of force can exist only between?

Last answer: A field of force can exist only between two ions.

0 like 0 dislike

98 views 1 answer

asked Mar 21, 2018 by anonymous

To avoid the effect of stray magnetic field in A.C. bridges we can use?

Last answer: To avoid the effect of stray magnetic field in A.C. bridges we can use magnetic screening.

0 like 0 dislike

110 views 1 answer

asked Mar 21, 2018 by anonymous

A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave?

Last answer: A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave will be of 5 Hz.

0 like 0 dislike

128 views 1 answer

asked Mar 21, 2018 by anonymous

Flashing the field of D.C. generator means?

Last answer: Flashing the field of D.C. generator means creating residual magnetism by a D.C. source.

0 like 0 dislike

58 views 1 answer