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Three charges of +5 Ca -6 C and +9 C are placed inside a sphere. What is the total flux passing through the surface of sphere?

A. 8 C

B. 14 C

C. 20 C

D. -6 C

Correct Answer :

A. 8 C


Related Questions

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Magnetic field intensity is a ________ quantity.

A. scalar

B. phasor

C. vector

D. variable

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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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Core materials of a good relay have _________ hysteresis loop.

A. large

B. narrow

C. very large

D. very narrow

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The temperature coefficient of resistance of eureka is

A. p ositive

B. negative

C. almost zero

D. i nfinite

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What is the SI unit of magnetic flux?

A. Tesla

B. Weber

C. Maxwell

D. Gauss

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The permittivity of a material is given by one of the following formulas.

A. DE

B. E/D

C. D^2/E

D. D/E

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Permeability means

A. The conductivity of the material for magnetic lines of force

B. The magnetization test in the material after exciting field has been removed

C. The strength of an electromagnet

D. The strength of the permanent magnet

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Refers to the non- metallic materials that have the ferromagnetic properties of iron.

A. Ferrites

B. Ferromagnetic

C. Diamagnetic

D. Paramagnetic

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One that has magnetic poles produced by internal atomic structure with no external current necessary

A. Diamagnetic

B. Permanent magnets

C. Paramagnetic

D. Electromagnetic

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The temperature coefficient of resistance of insulators is

A. zero

B. negative

C. positive

D. infinite

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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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Who demonstrated that there are magnetic effects around every current-carrying conductor and that current-carrying conductors can attract and repel each other just like magnets?

A. Luigi Galvani

B. Hans Christian Oersted

C. Charles Coulomb

D. Andre Ampere

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The force which set ups or tends to set up magnetic flux in a magnetic circuit

A. Dynamic force

B. Electromotive force

C. Potential difference

D. Magnetomotive force

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A magnetizing force of 1000 AT/m will produce a flux density of __________ i

A. 1.257 mWb/m^2

B. 0.63 Wb/m^2

C. 1.257 Wb/m^2

D. 0.63 mWb/m^2

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Whenever a conductor cuts magnetic fluxa an emf is induced in it. This is known as

A. Coulomb's law

B. Joule's law

C. Faraday's law

D. Ohm's law

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One oersted (Oe) is equivalent to _____ Gb/cm.

A.

B.

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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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Formed when there exist distant electronic interactions between (opposite) charges present in the neighboring atoms or molecules.

A. Ionic bond

B. Covalent bond

C. Metallic bond

D. Van der Waals bond

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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

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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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A magnetic circuit carries a flux iin the iron part and a fluxgin the air gap. What is the leakage coefficient?

A. i/g

B. i × g

C. g/ i

D. i + g

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Materials whose permeabilities are slightly greater than that of free space

A. Paramagnetic

B. Non- magnetic

C. Ferromagnetic

D. Diamagnetic

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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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The force acting on a pole of 5 Wb is 25 N. What is the intensity of the magnetic field?

A. 5 N/Wb

B. 25 N/Wb

C. 125 N/Wb

D. 0.2 N/Wb

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A good conductor has how many valence electrons?

A.

B.

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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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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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Bonding of atoms that is due to the force of attraction between positive ions and a group of negative ions

A. Ionic bond

B. Covalent Bond

C. Electrostatic Bond

D. Metallic bond

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The mass of proton is __________ the mass of an electron.

A. equal to

B. about 1837 times

C. less than

D. 200 tim es

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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