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Syllabus

Define magnetic elements of earth?

what is the si unit of permeability. what do Tm/A stands for?

WAT IS RETENTIVITY AND COERCIVITY

REPLY AS FAST AS POSSIBLE

what is the principle of moving coil galvanometer?

ans.. 16F

Why do magnetic field lines always form closed loops?

Are the following topics included in the cbse class 12 physics portions or have they been deleted?

1)Magnetization and magnetic intensity

a)susceptibility

b)permeability

2)Hysteresis loop and retentivity

A 2MeV proton is moving perpendicular to a uniform magnetic field of 2.5 Tesla the force on the proton is ?

(1) $\frac{{\mu}_{0}}{4\pi}\xb7\frac{M}{{d}^{3}}$ (2) $\frac{{\displaystyle {\mu}_{0}}}{{\displaystyle 4\pi}}\xb7\frac{{\displaystyle 2M}}{{\displaystyle {d}^{3}}}$ (3) $\frac{{\displaystyle {\mu}_{0}}}{{\displaystyle 4\pi}}\xb7\frac{{\displaystyle 2\sqrt{2}M}}{{\displaystyle {d}^{3}}}$ (4) Zero

what is difference between diamagnetic paramagnetic and ferromagnetic?atleast 10 points.

what are eddy currents and its applications???

The susceptibility of a magnetic material is 0.9853. Identify the type of the magnetic material.Draw the modification of field pattern on keeping piece of this material in a uniform magnetic field.

(a) 250 J (b) 200 J (c) 150 J (d) 10 J

Derive expression for magnetic dipole moment of an electron revolving around a nucleus

Give 5 differences between a bar magnet and a solenoid with their diagrams?

a jet plane is travelling west at 450 ms^{-1}. if the horizontal component of earth's magnetic field at that place is 4 * 10^{-4}Tesla and the angle of dip is 30 degrees, find the emf induced between the ends of the wings having span of 30 m.Working of Cyclotron?

Q4. A hollow sphere is released from rest on a rough inclined plane as shown in the figure. Find the velocity of point of contact as a function of time. (m = mass of hollow sphere, R = radius of sphere)

(A) 2 t (B) 4 t

(C) 6 t (D) 8 t

a) 2.4N

b) 1.2N

c) 0.6N

d) 0.3N

A thin bar magnet is cut into two equal parts.the ratio of moment of inertia to the magnetic moment of each part will become?(as compare to original magnet)

solution please.

options-1) 1/2

2)1/4

3)1/8

4)1

what is apparent angle of dip?

what do you mean by current sensitivity of a moving coil galvanometer ?on what factors does it depends?

The horizontal component of earth 's magnetic field at a place is B and angle of dip is 60 degrees. What is the value of vertical component of earth 's magnetic field at equator?

This question was asked in 2012 boards.I asked ths question yesterday also and the answer given by you is different from that available on this site where question-answers of previous year board papers are given.

there the answer is given to be zero and i don't undestand how. please review the question and explain how the vertical component of earth's magnetic field is zero at equator.

thank you

calculate magnetic flux density in a ring of iron of mean radius 0.25 m on which 1500 turns of wire are wound uniformly .The current passed is 5 amp.Take relative density of iron =1600

if a magnet is suspended at an angle 30 degree to the magnetic meridian the dip needle makes angle of 45 degree with the horizontal. the real dip is ??

an element delta l=delta x l is placed at the origin and carriersa current I=2A.find out magnetic field at point P on y axis at distance of 1.0m due to element delta x=1cm.give also direction of field produced?

^{-5}Wb in a bar of iron of cross section 0 .2 cm^{2}. Calculate the Permeability and Susceptibility of the bar ?^{-}^{2 }T. accelarationof particle is found to be a=xi+2j m/s^{2}. Find x.true value of dip at a place is 45 degree.the plane of the dip circle is turned through 60 degree from the magnetic meridian.find apparent value of dip?please explain me the question with the help of figure a and give its solution.

No link.... Detail solving ..

$\left(a\right)5\times {10}^{3}N/{m}^{2}\left(b\right)1.2\times {10}^{-4}N/{m}^{2}\phantom{\rule{0ex}{0ex}}\left(c\right)0.83\times {10}^{-4}N/{m}^{2}\left(d\right)30N/{m}^{2}$

magnetic field intensity due to magnetic dipole at an axial line and equitorial line.

Two magnets of magnetic moments M and 3

^{1/2 }M are joined to form a cross. The combination is suspended in a uniform magnetic field B. The magnetic moment M now makes an angle Î¸ with the field direction. find the value of angle Î¸.Q. If ${K}_{i}and{K}_{f}$ are the initial and final values of kinetic energy of a body respectively, then the work done by the net force on the body is equal to

$\left(a\right)\frac{{K}_{f}{K}_{i}}{{K}_{f}-{K}_{i}}\left(b\right){K}_{f}+{K}_{i}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(c\right)\frac{{K}_{f}+{K}_{i}}{2}\left(d\right){K}_{f}-{K}_{i}$

why a galvanometer is not used to measure current in a given circuit?

Sol. Answer (3) pls explainthe concept behind this

A wheel with 8 metallic spokes each 50cm long is rotated with a speed of 120rev./min . The earth's magnetic field at the place is 0.4G and the angle of dip is 60 . Calculate the emf induced between the axle and the rim of the wheel. How will the value of emf be affected if the number of spokes were increased ?

two identical charged particles moving with same speed enter a region of uniform magnetic field. if one of these enters normal to the feild direction and the other along a direction at 30'c with the field , what would be the ratio of their angular frequencies?

why is calcium listed as paramagnetic even though it has no unpaired electron ??

in what respect is a toroid different from a solenoid ? draw and compare the pattern of magnetic field lines in the 2 cases

Apparent dips when dip circle is placed in two mutually perpendicular directions are 30 and 45 degree.What is actual dip at that place???

A rod of length L, along East-West direction is dropped from a height H.

if B be the magnetic field due to earth at that place and angle of dip isx, then what is the magnitude of induced emf across two ends of the rodwhen the rod reaches the earth?What is the chemical formula of iron ore called natural magnet?

A charge Q moving in a straight line is accelerated by a potential difference V.it enter a uniform magnetic field B perpendicular to its path.

Deduse in terms of B an expearence radius of circular path which is travels

WHAT ARE THE ADVANTAGES OF BAR MAGNETS??

Write the expression for the magnetic moment due to a planar square loop of side ‘

l’ carrying a steady current I in a vector form.In the given figure this loop is placed in a horizontal plane near a long straight conductor carrying a steady current I

_{1}at a distancelas shown. Give reason to explain that the loop will experience a net force but no torque. Write the expression for this force acting on the loop.a magnetic needle free to rotate in a vertical plane, orients itself vertically at a certain place on earth. what are the values of horizontal component of earth's mag field and angle of dip at that place?

In figure, pulleys are ideal m

_{1 >}2m_{2}. Initially the system is in equilibrium and string connectingm_{2}to rigid support below is cut. Find the initial acceleration of m_{2}?Image - http://bit.ly/YrAX6M

Question is of Laws of Motion 11th..!!

A dip ciccle shows an apparent dip of 60 degree at a place where the true dip is 45 degree. if the dip circle is rotated throgh 90 degree, what apparent dip will it show? first of all please tell me what is the meaing of apparent dip.how can a dip be apparent? it should always be true dip?

2)) along its length ????

Which substance obeys Curie's Law ; feromagnetic or paramagnetic or both of them? give reason ,why they obey this law?

why does a freely suspended magnet always points along north- south direction. ?

two identical loops,one of copper and another of constantan are removed from a magnetic field within same interval of time,in which loop the induced current will be greater ?

PLZ TELL ME HOW TO SOLVE THIS NUMERICAL

A BAR OF 5*10

^{-3 }m^{2}IS SUBJECTED TO A FIELD OF 600 A/m.GIVEN SUSCEPTIBILITY IS 499,CALCULATE PEMEABILITY,FLUX DENSITY & MAGNETIC FLUX1) An electron and proton moving parallel to each other in the same direction with equal momentum enter into a uniform magnetic field which is at right angle to thier velocites trace their trajectories in the magnetic field.

A magnetised needle in a uniform magnetic field experience a torque but no net force . An iron nail near a bar magnet however experience a force of attraction in addition to a torque . How??

A closely wound solenoid of 2000 turns and area of cross-section 1.6 × 10

^{−4}m^{2}, carrying a current of 4.0 A, is suspended through its centre allowing it to turn in a horizontal plane.(a) What is the magnetic moment associated with the solenoid?

(b) What is the force and torque on the solenoid if a uniform horizontal magnetic field of 7.5 × 10

^{−2}T is set up at an angle of 30º with the axis of the solenoid?Horizontal component of earth's magnetic field at a place is root 3 times its vertical component . what is the value of angle of dip at the place ?

The angle of dip in southern India is about 18 degree, but the angle of dip in Britain is greater about 70 degree. How it is 70 degree?

A ball of mass m is tied with two strings of equal length on a rod !!! If the rod is rotated with angular velocity w ( omega ) , then ------(1) T1 = T2........(2) T2 is more than T1......(3) T1 is more than T2.......(4) T1 = T2 / 6 ..............(NOTE ----- T1 AND T2 ARE THE TENSIONS OF STRING 1 AND 2 RESPECTIVELY !!! ) KINDLY HELP !!!

We know that earth's magnetic field changes its direction over the years so now I want to ask when the direction of earth's magnetic field changes then magnetic declination, angle of dip and horizontal component of the earth's magnetic field shouls also change and if it is true then the magnetic compass would not show correct direction. CAN YOU EXPLAIN IN BRIEF.

A circular coil of radius 0.1m of number of turns 100, carries a current of 1.2A. Find the magnetic field a) at the centre of coil, b) at a point distance 0.2m from centre on the axis.a coil of 40 ohm resistance, 100 turns and radius 6mm is connected to ammeter of resistance 160 ohm. coilis placed perpendicular to the magnetic field. when coil is taken out of the field 32 microcoulomb charge flows through it. the magnetic flux density is:

distinguish the magnetic properties of dia, para and ferromagnetic substances in term of,

(a) susceptibility

(b) magnetic permeability

(c) coercivity

21.H_{2}, O_{2}, N_{2}, and He are enclosed in Identical containers under the similar conditions of pressure and temperature. The gases will have$\left(a\right)sameR.M.Sspeed\left(b\right)same\frac{K.E.}{kg}\phantom{\rule{0ex}{0ex}}\left(c\right)different\frac{K.E.}{mole}\left(d\right)same\frac{K.E.}{vol}$

16. A source of sound S emitting waves of frequency 100 Hz and an observed O are located at some distance from each other. The source is moving with a speed of 19.4 ms

^{-1}at an angle of 60^{o}with the source observed lines as shown in the figure. The observer is at rest. The apparent frequency observed by the observer (velocity of sound in air 330 ms^{-1}), is.(1) 106 Hz (2) 97 Hz

(3) 100 Hz (4) 103 Hz

What is Dip Circle? Explain its working.

1) If the coil is free to rotate about x axis torque on coil is given by 1/2iAB0icap

2)if the coil is free to rotate about y axis torque on the coil is given by -1/2iAB0j cap

3) resultant force on coil is zero

4)equation for torque μ vector cross B vector where μ is magnetic moment of coil is not valid on coil if any of the side is fixed as axis

Please answer urgently :

26.The following figure shows the variation of intensity of magnetisation versus the applied magnetic field intensity, Hj for two magnetic materials A and B:

(a) Identify the materials A and B.

(b) Why does the material B have a larger susceptibility than A for a given field at constant temperature?

1. Give reason: electric lines of force do not form closed loop while magnetic field lines form closed loop.2. Why do like poles repel each other and unlike poles attract each pole ? Give satisfactory reason.