Select Board & Class
Define magnetic elements of earth?
WAT IS RETENTIVITY AND COERCIVITY
REPLY AS FAST AS POSSIBLE
what is the si unit of permeability. what do Tm/A stands for?
what is the principle of moving coil galvanometer?
the critical angle for glass air interface is ic. will the critical angle for glass water interface be greater than or less than ic ? why?
Why do magnetic field lines always form closed loops?
A 2MeV proton is moving perpendicular to a uniform magnetic field of 2.5 Tesla the force on the proton is ?
what is difference between diamagnetic paramagnetic and ferromagnetic?atleast 10 points.
what are eddy currents and its applications???
why is calcium listed as paramagnetic even though it has no unpaired electron ??
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.
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?
what is the difference between magnetic induction and magnetizing field?
a jet plane is travelling west at 450 ms-1. if the horizontal component of earth's magnetic field at that place is 4 * 10-4Tesla and the angle of dip is 30 degrees, find the emf induced between the ends of the wings having span of 30 m.
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?
Working of Cyclotron?
HELP!!! What is end-on position and broadside on position?
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)
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.
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 ??
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.
Two magnets of magnetic moments M and 31/2 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 θ with the field direction. find the value of angle θ.
why a galvanometer is not used to measure current in a given circuit?
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?
in what respect is a toroid different from a solenoid ? draw and compare the pattern of magnetic field lines in the 2 cases
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.
Apparent dips when dip circle is placed in two mutually perpendicular directions are 30 and 45 degree.What is actual dip at that place???
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?
A rod of length L, along East-West direction is dropped from a height H.
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
Why is diamagnetism independent of temperature?
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 I1 at a distance l as 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?
why does a freely suspended magnet always points along north- south direction. ?
1) 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.
closely wound solenoid of 2000 turns and area of cross-section
carrying a current of 4.0 A, is suspended through its centre allowing
it to turn in a horizontal plane.
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 ?
A magnet weighs 75gm and its magnetic moment is 2000cgs units .If the density material is 7.5g/cc,calculate the intensity of magnetisation
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 !!!
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:
1. How does the intensity of magnetization of a paramagnetic sample vary with temperature?
distinguish the magnetic properties of dia, para and ferromagnetic substances in term of,
(b) magnetic permeability
Which substance obeys Curie's Law ; feromagnetic or paramagnetic or both of them? give reason ,why they obey this law?
here, its written that "The North magnetic pole is located at latitude of 79.74° N and a longitude of 71.8° W, a place somewhere in North Canada. The magnetic South Pole is at 79.74° S and 108.22° E in Antarctica." But in the video its showing south pole and mentioning the location as 79.74° N and 71.8° W...
What is Dip Circle? Explain its working.
What is faradays right hand rule and how does it help to assign a direction ie whether the current is flowing from north or south?
how does coercivity and retentivity depend on the width of hysteresis curve?
what is 1/4IIEo
Copyright © 2022 Aakash EduTech Pvt. Ltd. All rights reserved.
E.g: 9876543210, 01112345678
We will give you a call shortly, Thank You
Office hours: 9:00 am to 9:00 pm IST (7 days a week)