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4

As the magnetic intensity decreasesa the relative permeability of a magnetic material

A. decreases

B. remains the same

C. increases

D. becomes zero

Correct Answer :

C. increases


Related Questions

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The force of attraction or repulsion between two magnetic poles is inversely proportional to the square of the distance between them. This is known as

A. Newton's first law

B. Faraday's first law of electromagnetic induction

C. Coulomb's first law

D. Coulomb's second law

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One of the common application of an air- cored choke.

A. Radio frequency

B. Audio frequency

C. Power supply

D. Power transformer

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A magnetic field is

A. The current flow through space around a permanent magnet

B. The force set up when current flows through a conductor

C. The force that drives current through a resistor

D. The force between the plates of a charged capacitor

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4

What is the SI unit of specific resistance or resistivity?

A. Ohm-circular mil per inch

B. Ohm-circular mil per foot

C. Ohm-m

D. Ohm-cm

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4

The lagging effect between flux density of the material and the magne

A. Permeance

B. Eddy current

C. Hysteresis

D. R eluctance

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4

Calculate the flux density that will be produced by the field intensity of 2000 a. t/m for a permeability of 126 x 10^-6 T/A.t/m

A. 0.252 G

B. 0.252 x 10^-2 T

C. 0.252 T

D. 0.252 x 10^-2 G

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4

Theory of ferromagnetic phenomena which assumes each atom is a permanent magnet which can turn freely about its center under the influence of applied field and other magnets.

A. Ewing's theory of ferromagnetism

B. Oersted's ferromagnetism theory

C. Maxwell's magnetic theory

D. Ampere's circuital law

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4

A factor used to correct for the electrostatic forces of the more distant ions in an ionic solid.

A. Avogadro's number

B. Planck's constant

C. Boltzmann's constant

D. Madelung constant

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Which of the following materials has permeability slightly less than that of free space?

A. Paramagnetic

B. Non- magnetic

C. Ferromagnetic

D. Diamagnetic

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4

When a wire loop is rotated in a magnetic field the direction of the induced emf changes one in every _______ revolution

A.

B.

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4

If the number of valence electrons of an atom is less than 4a then the substance is probably

A. a metal

B. an insulator

C. a non-metal

D. a semiconductor

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4

Which of the following statements is TRUE?

A. Silicon dioxide is a good

B. The current carriers in conductors are valence electrons

C. For conductorsa the valence electron are strongly attracted to the nucleus

D. The valence electrons are located in the nucleus of an atom

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The point in a magnet where the intensity of magnetic lines of force is maximum

A. Magnetic pole

B. South pole

C. North pole

D. Unit pole

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Gases whose particles are charged are known as

A. Conductors

B. Insulators

C. Gaseous Conductors

D. Plasma

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Electron is a Greek word for

A. amber

B. Fire

C. Stone

D. Heat

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A 6- V battery is connected across a solenoid of 100 turns having a resistance of 2 ?a Calculate the number of ampere turns?

A.

B.

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The B-H curve of ________ is not a straight line.

A. air

B. wood

C. silicon steel

D. soft iron

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The ability of a material to conduct magnetic flux through it.

A. Permittivity

B. Reluctivity

C. Conductivity

D. Permeability

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What principle states that each electron in an atom must have a different set of quantum numbers?

A. Inclusion principle

B. Exclusion principle

C. Quantum principle

D. Electron principle

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4

The magnetic field of a bar magnet most closely resembles the magnetic field of

A. a horseshoe magnet

B. a straight current- carrying wire

C. a stream of electrons moving parallel to one another

D. a current- carrying wire loop

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4

What determines the atomic number of an element?

A. The number of protons

B. The number of electrons

C. The number of neutrons

D. The number of neutrons and protons

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4

The greater percentage of materials is _________.

A. diamagnetic

B. paramagnetic

C. ferromagnetic

D. non-magnetic

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4

The force between two magnetic poles is _______ their pole strengths.

A. directly proportional to

B. the sum of

C. inversely proportional to

D. the product of

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4

A test charge means a charge of

A. -1 C

B. 1 electron

C. +1 C

D. -20 C

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The electric field intensity between the parallel plate air capacitor is 20 N/C. If an insulating slab of relative permittivity 5 is placed between the platesa then electric field intensity will be

A. 20 N/C

B. 100 N/C

C. 4N/C

D. 40 N/C

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4

The evaporation of electrons from a heated surface is called

A. Radiation

B. Convection

C. Thermionic emission

D. Conduction

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When the relative permeability of a material is much greater than 1a it is called _______ material.

A. diamagnetic

B. ferromagnetic

C. paramagnetic

D. non-magnetic

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When the current flowsa the magnetic field ��. conductor is in what direction?

A. The same as the current direction

B. Opposite the current direction

C. Omnidirectional

D. In the direction determined by the left hand rule

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4

If the number of valence electrons of an atom is less than 4a the substance is called

A. a conductor

B. a semiconductor

C. an insulator

D. a superconductor

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Residual magnetism refers to the flux densitya which exists in the iron core when the magnetic field intensity is

A. Minimized

B. Reduced to zero

C. Maximize

D. Unity