Unlike the field of a permanent magnet, the field of an electromagnet: Select one: a. only exists in a coil. b. cannot induce voltage in a conductor. c. has no poles. d. exists only as long as current flows.
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Unlike the field of a permanent magnet, the field of an electromagnet:
Select one:
a. only exists in a coil.
b. cannot induce voltage in a conductor.
c. has no poles.
d. exists only as long as current flows.
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- A permanent magnet is a piece of magnetic material that has been magnetized and can hold its magnetic strength for a reasonable length of time. Select one: TRUE FALSE:The magnetic flux density within a bar of some material is 0.630 tesla at an H field of 5×105A/m . Compute the following for this material: (a) the magnetic permeability, and (b) the magnetic susceptibility. (c) What type(s) of magnetism would you suggest is(are) being displayed by this material ? Why ?Electric field Produced by the motion of electric charges, or electric current, and gives rise to the magnetic force associated with magnets. الاجابات True False
- When changes occur in a magnetic field that intersects a conductor, what results? Select one: a. Induced voltage. b. Increased conductor resistance. c. An overload condition. d. A short circuit.Q20 The statement is True or False? A current carrying conductor placed in a magnetic field experience a force, is it true for motor?The surface area of the area covered by the conductive wire, which consists of a single loop in the form of a square with a side length of 22 cm, is parallel to the magnetic field. If a current of 6.3 A is flowing through this wire and the torque is 0.325 N.m, what is the strength of the magnetic field, in Tesla?
- Energy is stored in the in the form of a magnetic field inside of a magnet but not outside of a magnet. Select one: True FalseApply the concepts of magnetostatics to compute magnetic field intensity of a long, straight wire carrying a correct of 1 A at a distance of 5 meter meter from it. 8)Analyze the boundary value conditions in the illustration given below and frame the equations in terms of magnetic flux density Medium 1 AS(a,) Ah2 Ah/2 ar AS(-aN) BN2 Medium 2Describe, with the aid of sketches, the effect on acurrent-carrying conductor lying in and at right anglesto a magnetic field.Exercises 46 continuedThe coil of a moving-coil instrument is woundwith 40 turns. The mean width of the coil is 4 cmand the axial length of the magnetic field is 5 cm. If theflux density in the gap is 0.1 T, calculate the torque inN m when the coil is carrying a current of 10 mA
- Given a magnetic circuit with a current 2.6A flowing through 205 turns of wire on a core having a reluctance of 125000 At/Wb. Determine the magnetomotive force of the circuit in base units.A horse shoe magnet has two poles, each of area 5 cm2. Find the pull between the poles and the keeper when the flux density at the contact surface is 1 Wb/m2?.________ is a term used to describe a material's ability to retain magnetism. a) Coercive force b) Retentivity c) either "a" or "b" d) neither "a" nor "b" A coercive force is desirable in materials that is intended to be used as temporary magnets. a) low b) high c) extremely high d) any of the above A) Upon what does the electroniagnetic strength of an air-cored coil depend? a) number of turns in the coil b) amount of current flowing through the coil c) both "a" and "b" d) neither "a" nor "b" B) Upon what does the electromagnetic strength of an iron-cored coil depend? a) amount of current flow b) number of turns c) permeability of the core d) all of the above The left hand rule for a coil is such that if you were to hold a coil in your left hand with your fingers pointing in the direction of electron flow, your thumb would point in the direction of the a) electron flow b) lines of flux c) north pole face d) none of the above