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4

A theorem which states that an electric current flowing in a circuit produces a magnetic field at external points equivalent to that due to a magnetic shell whose bounding edge is the conductor and whose strength of the current.

A. Joule's law

B. Faraday's law

C. Volta's theorem

D. Ampere's theorem

Correct Answer :

D. Ampere's theorem


Related Questions

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4

If a 20 V potential is applied across a relay coil with 50 turns having 1 ? of resistancea the total magnetomotive producing magnetic flux in the circuit is

A. 10 Wb

B. 50 T

C. 1000 A t/m

D. 1000,t

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4

What is the reluctance of a magnetic path having a length of 2x 10^-3m and crosssectional area of 2.5 x 10^-3 m^2?

A. 6366 A, t/Wb

B. 6000 A, t/Wb

C. 8x10^-3 A, t/Wb

D. 0.8 A, t/Wb

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4

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

A. a semiconductor

B. a conductor

C. an insulator

D. a semi-insulator

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4

If the solenoid is gripped by the right hand with the fingers pointing the direction of current flowa the outstretched thumb will then point the north pole. This is known as

A. Right hand rule

B. Helix rule

C. End rule

D. Cork screw rule

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4

If a magnetic flux cuts across 200 turns at a rate of 2Wb/sa the induced voltage according to Faraday's law is about

A. 400 V

B. 100 V

C. 200 V

D. 600 V

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4

Who discovered the most important electrical effects which is the magnetic effect?

A. Hans Christian Oersted

B. Sir Charles Wheatstone

C. Georg Ohm

D. James Clerk Maxwell

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A law stating that the magnetic susceptibilities of most paramagnetic substances are inversely proportional to their absolute temperatures.

A. Curie's Law

B. Child's Law

C. CR Law

D. Curie-Weiss Law

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4

What is the diameter of an atom?

A. About 10^-10 m

B. About 10^-10 cm

C. About 10^-10 mm

D. About 10^-10 �m

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4

The magnetic potential in a magnetic circuit can be measured in terms of

A. Mmf

B. Emf

C. Farad

D. Coulomb

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4

How is mutual inductance between two coils decreased?

A. By using a common core

B. By moving the coils closer

C. By moving the coils apart

D. By increasing the number of turns of either coil

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4

The net electrical charge in an isolated system remains constant. This is known as

A. Law of conservation of charge

B. Coulomb's first law

C. Coulomb's second law

D. Law of conservation of energy

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4

The amount of magnetizing force to counter balance the resid magnetic material is referred to as

A. Reluctivity

B. Susceptivity

C. Coercivity

D. Retentivity

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4

Calculate the permeability (in T/A. t/m) of a magnetic material that has a relative permeability of 300

A. 3.78 x 10^4

B. 3.78 x 10^-5

C. 3.78 x 10^-3

D. 3.78 x 10^-6

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

A. decreases

B. remains the same

C. increases

D. becomes zero

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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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Hydrogen is an example of a _____ material.

A. Paramagnetic

B. Diamagnetic

C. Ferromagnetic

D. N on- magnetic

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The K shell or the first shell has how many permissible number of orbiting electrons?

A.

B.

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One farad equals

A. 1 coulomb/volt

B. 1 newton/coulomb

C. 1 newton-meter

D. 1 volt/second/ampere

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4

The temperature coefficient of resistance of semiconductors is

A. positive

B. zero

C. negative

D. infinite

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4

The dielectric constant of most materials lies between

A. 1 and 10

B. 10 and 20

C. 20 and 50

D. 50 and 100

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4

This paper does not exhibit electricity because it contains the same number of

A. protons and electrons

B. neutrons and electrons

C. neutrons and positrons

D. atoms

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4

A magnetic material losses its ferromagnetic properties at a point called

A. Curie temperature

B. Inferred absolute temperature

C. Room temperature

D. Absolute temperature

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4

How many electrons are needed in the valence orbit to give a material's stability?

A.

B.

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The force acting on a unit n- pole placed at that point is called

A. Magnetic field intensity

B. Electric field intensity

C. Electromagnetic field intensity

D. Intensity magnetization

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What bond is formed when one or more electrons in the outermost energy orbit of an atom are transferred to another?

A. Ionic

B. Covalent

C. Metallic

D. Van der Waals

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4

One ampere- turn is equivalent to _____ gilberts

A.

B.

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The reluctance of a magnetic circuit is not dependent on which of the following?

A. Number of turns of coil

B. Magnetomotive force

C. Flux density in the circuit

D. Current in the coil

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4

The reluctance of a magnetic circuit varies with

A. length × area

B. area � length

C. length � area

D. length + area

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The physical motion resulting from the forces of magnetic fields is called

A. Motor action

B. Rotation

C. Repulsion

D. Torque action

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The diameter of a hydrogen atom is approximately ______ cm.

A. 1.1 x 10^-6

B. 1.1 x 10^7

C. 1.1 x 10^-8

D. 1.1 x 10^-9