Recent questions tagged easy

For a para magnetic substance

asked Jul 22, 2015 by meena.p

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The magnetic susceptibility of a super conductor is __________

asked Jul 22, 2015 by meena.p

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Iso gonic lines are the lines joining places of ____________

asked Jul 22, 2015 by meena.p

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The small angle between magnetic axis and geographic axis at a place is called _________ at that place .

asked Jul 22, 2015 by meena.p

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The value of H on the surface of earth is of the order of ___________

asked Jul 22, 2015 by meena.p

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A freely suspended magnet at equator will set itself _________ to the surface of earth

asked Jul 22, 2015 by meena.p

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If $\lambda$ is the magnetic latitude at a place, then what is the relation between the angle of dip and $\lambda$ magnetic latitude .

asked Jul 22, 2015 by meena.p

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In a tangent galvanometer , When a current of $10\;mA$ is passed the deflection is $31^{\circ}$ By what percentage , the current has to be increased , so as to produce a deflection of $42^{\circ}$?

asked Jul 22, 2015 by meena.p

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Two identical thin bar magnets, each of length L and pole strength m are placed at right angles to each other, with the north pole of one touching the south pole of the other . Find the magnetic moment of the system.

asked Jul 21, 2015 by meena.p

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What is the approximate distance upto which earth's magnetic field extends?

asked Jul 21, 2015 by meena.p

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A magnetic dipole is situated in the direction of a magnetic field . What is its potential energy ?

asked Jul 21, 2015 by meena.p

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Give two examples of magnetic dipole

asked Jul 21, 2015 by meena.p

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Why do magnetic lines of force prefer to pass through ferromagnetic substance than through air ?

asked Jul 21, 2015 by meena.p

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Name the material used in making the core of moving coil galvanometer .

asked Jul 21, 2015 by meena.p

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A magnetic needle of a magnetic moment $60 Am^2$ is placed at a place . The needle points towards the geographical north. using the data given below, find the value of declination at the point . Horizontal component of earth magnetic field $=40 \times 10^{-6}wb m^{-2}$ and torque experienced by the needle $=1.2 \times 10^{-3}Nm$

asked Jul 20, 2015 by meena.p

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What is the SI unit for magnet flux and magnetic field strength

asked Jul 20, 2015 by meena.p

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What is the $SI$ unit of pole strength ?

asked Jul 20, 2015 by meena.p

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Name any two dia magnetic substance

asked Jul 20, 2015 by meena.p

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State tangent law in magnetism.

asked Jul 20, 2015 by meena.p

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What is the reduction factor of galvanometer . The amount of of current required to produce $45^{\circ}$ deflection in a galvanometer is defined as it reduction factor.

asked Jul 20, 2015 by meena.p

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How does the magnetic moment of each part of the bar magnet . change if it is cut into two equal pieces along its length ?

asked Jul 20, 2015 by meena.p

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Where on the earth's surface is the value of angle of dip maximum ?

asked Jul 20, 2015 by meena.p

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What is the value of the horizontal component of the earth 's magnetic field at magnetic poles?

asked Jul 20, 2015 by meena.p

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Consider the plane S formed by the dipole axis and the axis of earth . Let P be point of intersection of the geographical and magnetic equators. Obtain the declination and dip angles at P and Q.

asked Jul 16, 2015 by meena.p

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The current in the coil is reversed and the coil is rotated about its vertical axis by an angle of $90^{\circ}$ in the anti clock wise sense looking from above . Predict the direction of the needle. Take the negative declination at the places to be zero.

asked Jul 15, 2015 by meena.p

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What kind of ferromagnetic material is used for coating magnetic tapes in casette player or for building memory stores in a modern computer ?

asked Jul 14, 2015 by meena.p

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The hysteresis loop of a soft iron piece has a much smaller are than that of a carbon steel piece . If the material is to go through repeated cycle of magnetization , Which piece will dissipate greater heat energy ?

asked Jul 14, 2015 by meena.p

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Explain quantitative on the basis of domain picture the reversibility of a ferromagnet?

asked Jul 14, 2015 by meena.p

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Would the maximum possible magnetization of a para magnetic sample be of the same order of magnitude as the magnetization of a ferromagnet.

asked Jul 14, 2015 by meena.p

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If a torrid uses Bismuth for its core, will the field in the core be (slightly ) greater or (slightly ) less than when the core is empty ?

asked Jul 14, 2015 by meena.p

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Is the permeability of a ferromagnetic material independent of the magnetic field ? If not, is it more for lower or higher fields?

asked Jul 14, 2015 by meena.p

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Magnetic field lines are always nearly normal to the surface of a force magnet at every point. (This fact is analogous to the static electric field lines being normal to the surface of a conductor at every Point ) Why?

asked Jul 14, 2015 by meena.p

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Why is diamagnetism, in contract , almost independent of temperature ?

asked Jul 14, 2015 by meena.p

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Why does a para magnetic sample display greater magnetization (for the same magnetizing field) when colled ?

asked Jul 14, 2015 by meena.p

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A closely wound solenoid of 800 turns and area of cross section $2.5 \times 10^{-4} \;m^2$ carries a current of $3.0 \;A$Explain the same in which the solenoid acts like a bar magnet . What is its associate magnetic moment ?

asked Jul 10, 2015 by meena.p

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Instellar space has an excellently weak magnetic field of the order of $10^{-12}\;T$ can such a weak field be of any significant consequence. Explain

asked Jul 10, 2015 by meena.p

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The earth's field departs from its dipole shape substantially at large distance (greater than about 30,000 km) What agencies may be responsible for this distortion ?

asked Jul 10, 2015 by meena.p

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The earth may have reversed the direction of its field several times during its history of 4 to 5 billion years. How can geologists know about the earth field in such distant past ?

asked Jul 9, 2015 by meena.p

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The charged currents in the outer conducting regions of the earth core are thought to be responsible for earth's magnetism. What might be the battery (ie the cource of energy ) to sustain these currents ?

asked Jul 9, 2015 by meena.p

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The earth's core is known to contain iron. yet geologists do not regard this as a source of the earth mergnetisum . Why ?

asked Jul 9, 2015 by meena.p

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The earth's magnetic field from point to point in space . Does it also charge with time ? If so on what time scale does it change appreciably ?

asked Jul 9, 2015 by meena.p

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Geologist claim that besides the main magnetic N-S poles, there are several local poles on the earth's surface oriented in different direction . How is such a thing possible at all ?

asked Jul 9, 2015 by meena.p

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In which direction would a compass free to move in the vertical plane point to, if located right on the geomagnetic north or south pole ?

asked Jul 9, 2015 by meena.p

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The earth's field it is claimed roughly approximately the field due to a dipole of magnetic moment $8 \times 10^{22}J/T$ located at its centre. Check the order of magnitude of this number is same way

asked Jul 9, 2015 by meena.p

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If you made a map of magnetic field line at Melbourne in Australian, would the line seem to go into the ground or come out the ground ?

asked Jul 9, 2015 by meena.p

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The angle of dip at a location in southern India is about $18^{circ}$ would you expect a greater or smaller dip in Britain ?

asked Jul 9, 2015 by meena.p

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A vector needs three quantities for its specification . Name the three independent quantities conventionally used to specify the earth's magnetic field ?

asked Jul 9, 2015 by meena.p

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Three point charges $+2q,-q$ and $ +3q$ . What is the electric flux due to this configuration through the surface S?

asked Jul 8, 2015 by meena.p

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If a point change be rotated in a circle of radius r around a charge q, what will be the work done ?

asked Jul 8, 2015 by meena.p

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Electrostatic potential V at a point of a distance r from a charge q varies as

asked Jul 8, 2015 by meena.p

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