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4

Two similar polesa each 1Wba placed 1 m apart in air will experience a repulsive force of

A. 63000 N

B. 63 × 10^-3 N

C. 8 × 10^12 N

D. 796 kN

Correct Answer :

A. 63000 N


Related Questions

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A group of magnetically aligned atoms is called

A. Range

B. Lattice

C. Domain

D. Crystal

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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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4

Electric lines of force leave or enter the charge surface at an angle of

A. 30o

B. 45 o

C. 90o

D. depending upon the angle of launch and entry

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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 on looking at any one end of a solenoid; the direction of current flow is found to be clockwise then the end under observation is a south pole. This is known as

A. Right hand rule

B. Left hand rule

C. Cork screw rule

D. End Rule

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4

What is another name for relative permittivity?

A. Dielectric strength

B. Electric intensity

C. Potential gradient

D. Dielectric constant

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The resistivity of a conductor ___________ with an increase in temperature.

A. increases

B. decreases

C. remains the same

D. becomes zero

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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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4

Flux density is measured in

A. Tesia

B. Weber

C. Ampere- turn

D. Maxwell

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4

Under ordinary conditionsa a body is considered

A. positively charged

B. neutral

C. negatively charged

D. stable

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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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Refers to the magnetic lines

A. Flux

B. Hysteresis

C. Current

D. Magnetomotive force

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Which of the following is used by permanent magnets as the magnetic material?

A. iron

B. nickel

C. soft steel

D. hardened steel

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Cobalt is an example of a ______ material.

A. Paramagnetic

B. Diamagnetic

C. Ferromagnetic

D. Non- magnetic

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4

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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The force between two magnetic poles is _____ the relative permeability of the medium.

A. directly proportional to

B. independent of

C. inversely proportional to

D. equal to

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4

What bond is formed when electrons in the outermost energy orbits of the atoms are shared between two or more electrons?

A. Ionic

B. Covalent

C. Metallic

D. Van der Waals

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The ratio of the permeability of material to the permiabiity of air or vacuum.

A. Relative permeability

B. Relative permittivity

C. Relative conductivity

D. Relative reluctivity

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An atom or a group of atoms that carries a net electric charge.

A. Positive ion

B. Negative ion

C. Ion

D. Electron

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An alloy of 40 percent iron and 60 percent nickel.

A. Alnico

B. Permalloy

C. Hipernik

D. Manganin

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The relation between absolute permittivity of air ( 0)a absolute p and velocity of light (c) is given by

A. 0 0= c^2

B. 0 0= c

C. 1/ 0 0= c

D. 1/ 0 0= c^2

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Germanium atom has ______ protons and ______ electrons.

A. 32, 32

B. 32, 42

C. 42, 32

D. 34, 34

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The greater percentage of materials is _________.

A. diamagnetic

B. paramagnetic

C. ferromagnetic

D. non-magnetic

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The electric potential at a point in air due to a charge is 21 V. If the air is replaced by a medium of relative permittivity of 3a then electric potential at that point will be

A. 63 V

B. 21 V

C. 7 V

D. 42 V

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4

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

Back emf refers to the

A. Current equal to the applied emf

B. Opposing emf

C. Current opposing the applied emf

D. Voltage opposing the applied emf

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4

The emf produced in a wire by its motion across a magnetic field does not depend upon the

A. Diameter of the wire

B. Length of the wire

C. Orientation of the wire

D. Flux density of the field

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An effect which is generally used in the gausameter to measure flux density.

A. Skin effect

B. Magnetic effect

C. Hall effect

D. Flywheel effect

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The electrons in the last orbit of an atom are called _______ electrons.

A. free

B. valence

C. bound

D. thermionic

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Which of the following materials has the least hysteresis loop area?

A. soft iron

B. silicon steel

C. hard steel

D. wrought iron