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Recent questions and answers in Magnetism and matter

Questions >> CBSE XII >> Physics >> Magnetism and matter

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answered Jul 5, 2017 by pady_1

1 answer

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answered Jul 5, 2017 by pady_1

1 answer

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answered Jul 5, 2017 by pady_1

1 answer

For a para magnetic substance

answered Jul 22, 2015 by meena.p

1 answer

The magnetic susceptibility of a super conductor is __________

answered Jul 22, 2015 by meena.p

1 answer

The susceptibility of magnetism at book is $ 1.2 \times 10^{-5}$ At what temperature will the susceptibility be equal to $1.44 \times 10^5?$

answered Jul 22, 2015 by meena.p

1 answer

A circular coil of $300$ turns and diameter 14 cm carries a current of $15\;A$ . What is the magnitude of magnetic moment associated with the coil ?

answered Jul 22, 2015 by meena.p

1 answer

Iso gonic lines are the lines joining places of ____________

answered Jul 22, 2015 by meena.p

1 answer

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

answered Jul 22, 2015 by meena.p

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

answered Jul 22, 2015 by meena.p

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

answered 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 .

answered Jul 22, 2015 by meena.p

1 answer

A short bar magnet is placed with its north pole pointing south . The natural point is $15\;cm$ away from the center of the magnet. If $H= 0.5 \;G$, Calculate the magnetic moment of the magnet.

answered Jul 22, 2015 by meena.p

1 answer

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 $42^{\circ}$?

answered Jul 22, 2015 by meena.p

1 answer

In a magnetic of a certain place, the horizontal component of the earth magnetic field is $0.26 \;G$ and dip angle is $60^{\circ}$ What is the magnetic field of earth at this location ?

answered Jul 22, 2015 by meena.p

1 answer

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.

answered Jul 21, 2015 by meena.p

1 answer

A magnetized steel wire $31.4\;cm$ long has pole strength of $0.2 \;Am$ It is then bent in the form of a semicircle. Calculate the magnetic moment of the needle.

answered Jul 21, 2015 by meena.p

1 answer

A compass needle whose magnetic moment is $60Am^2$ pointing geographic north at a certain place, Where the horizontal component of earth's magnetic field is $40 \mu wbm^{-2}$ experiences a torque $1.2 \times 10^{-3}\;Nm$ What is the declination of the place?

answered Jul 21, 2015 by meena.p

1 answer

The declination at a place is $20^{\circ}$ west. In what direction should a ship be stressed so that it reaches geographic north east ?

answered Jul 21, 2015 by meena.p

1 answer

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

answered Jul 21, 2015 by meena.p

1 answer

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

answered Jul 21, 2015 by meena.p

1 answer

Give two examples of magnetic dipole

answered Jul 21, 2015 by meena.p

1 answer

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

answered Jul 21, 2015 by meena.p

1 answer

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

answered Jul 21, 2015 by meena.p

1 answer

An electron and a proton equal momenta, enter a uniform magnetic field at right angles to the field lines. What will be the ratio of the radii of an vature of there trajectories .

answered Jul 21, 2015 by meena.p

1 answer

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 ?

answered Jul 21, 2015 by meena.p

1 answer

Why do we prefer steel or alnico for making permanent magnets ?

answered Jul 21, 2015 by meena.p

1 answer

A coil of 200 turns has a cross -sectional area $900 mm^2$ . if carries a current of 2 ampere . The plane of the coil is perpendicular to a uniform magnetic field of $0.5 \;T$ Calculate the magnetic moment of the coil.

answered Jul 21, 2015 by meena.p

1 answer

State curies's law in magnetism?

answered Jul 21, 2015 by meena.p

1 answer

A magnetic needle of magnetic moment $4.8 \times 10^{-2}\;JT^{-1}$ is placed at $30^{\circ}$ with the direction of uniform magnetic field of magnitude $3 \times 10^{-2} \;T$ Calculate the torque acting on the needle

answered Jul 21, 2015 by meena.p

1 answer

A magnetized needle is placed $30^{\circ}$ with direction of uniform magnetic field of intensity $3 \times 10^{-2}\;T$ The torque acting on the needle is $7.2 \times 10^{-4} \;J$ Calculate the magnetic moment of the needle .

answered Jul 20, 2015 by meena.p

1 answer

The vertical component of earth magnetic field at a plane is $\large\frac{1}{\sqrt 3}$ times the horizontal component. What is the value of angle of dip at this place ?

answered Jul 20, 2015 by meena.p

1 answer

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 $=1.2 \times 10^{-3}Nm$

answered Jul 20, 2015 by meena.p

1 answer

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

answered Jul 20, 2015 by meena.p

1 answer

Name any two dia magnetic substance

answered Jul 20, 2015 by meena.p

1 answer

State tangent law in magnetism.

answered Jul 20, 2015 by meena.p

1 answer

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.

answered Jul 20, 2015 by meena.p

1 answer

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

answered Jul 20, 2015 by meena.p

1 answer

How does the pole strength of each part of bar magnet change if it is cut into equal piece along its length ?

answered Jul 20, 2015 by meena.p

1 answer

How does the magnetic moment of each part of the bar magnet change it is cut into two equal piece transverse to its length ?

answered Jul 20, 2015 by meena.p

1 answer

How does the pole strength of each part of a bar magnet change if it is cut into two equal pieces transverse to its length ?

answered Jul 20, 2015 by meena.p

1 answer

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

answered Jul 20, 2015 by meena.p

1 answer

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

answered Jul 20, 2015 by meena.p

1 answer

There are two current planer coils made each from identical wires of length L. $C_1$ is circular coil (radius R) and $C_2$ is square (side a). They are so constructed that they have same frequency of oscillation when they are placed in the same uniform magnetic field B and carry same current. Find a in term of R.

answered Jul 20, 2015 by meena.p

1 answer

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.

answered Jul 16, 2015 by meena.p

1 answer

Assume the dipole model for earth's magnetic field B which is given by $B_v$ =Vertical component of magnetic field $=\large\frac{\mu_0}{4 \pi}.\frac{2m \cos \theta}{r}$ $B_H$= Horizontal component of magnetic field $\qquad= \large\frac{\mu_o}{4 \pi} \frac{\sin \theta m}{r^3}$ $\theta= 90^{\circ}$- latitude as measured from magnetic equator . Find loci of points for which dip angle is $\pm 45^{\circ}$

answered Jul 16, 2015 by meena.p

1 answer

Assume the dipole model for earth's magnetic field B which is given by $B_v$ =Vertical component of magnetic field $=\large\frac{\mu_0}{4 \pi}.\frac{2m \cos \theta}{r}$ $B_H$= Horizontal component of magnetic field $\qquad= \large\frac{\mu_o}{4 \pi} \frac{\sin \theta m}{r^3}$ $\theta= 90^{\circ}$- latitude as measured from magnetic equator . Find loci of points for which clip angle is zero.

answered Jul 16, 2015 by meena.p

1 answer

Assume the dipole model for earth's magnetic field B which is given by $B_v$ =Vertical component of magnetic field $=\large\frac{\mu_0}{4 \pi}.\frac{2m \cos \theta}{r}$ $B_H$= Horizontal component of magnetic field $\qquad= \large\frac{\mu_o}{4 \pi} \frac{\sin \theta m}{r^3}$ $\theta= 90^{\circ}$- latitude as measured from magnetic equator . Find loci of points for which $|B|$ is minimum

answered Jul 16, 2015 by meena.p

1 answer

A bar magnet of magnetic m and moment of inertia I (about center , perpendicular to length ) is cut into two equal pieces, perpendicular to length . Let T be the period of oscillations of the original magnet about an axis . through the mid -point , perpendicular to length , in a magnetic field B. What would be the similar period $T^1$ for each piece?

answered Jul 16, 2015 by meena.p

1 answer

A proton has spin and magnetic moment just line an electron , Why then its effect is neglected in magnetism of materials?

answered Jul 16, 2015 by meena.p

1 answer

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