Advertisements
Advertisements
प्रश्न
Figure shows some of the equipotential surfaces of the magnetic scalar potential. Find the magnetic field B at a point in the region.
Advertisements
उत्तर
Given :
Perpendicular distance, `dx = 10 sin 30^circ "cm" = 0.05 "m"` ,
Change in the potential, dV = `0.1 xx 10^-4 "T-m"`
We know that the relation between the potential and the field is given by
`B = -(dV)/(dx)`
⇒ `B = -(0.1 xx 10^-4 "T-m")/(5 xx 10^-2 "m")`
⇒ `B = -2 xx 10^-4 "T"`
B is perpendicular to the equipotential surface. Here, it is at angle of 120° with the positive x-axis.
APPEARS IN
संबंधित प्रश्न
State how magnetic susceptibility is different for the three types of magnetic materials, i.e. diamagnetic, paramagnetic and ferromagnetic materials
What are permanent magnets? Give one example ?
Why is the core of an electromagnet made of ferromagnetic materials?
Can we have a single north pole, or a single south pole?
A dip circle is taken to geomagnetic equator. The needle is allowed to move in a vertical plane perpendicular to the magnetic meridian. The needle will stay ______.
Which of the following four graphs may best represent the current-deflection relation in a tangent galvanometer?
To measure the magnetic moment of a bar magnet, one may use
(a) a tangent galvanometer
(b) a deflection galvanometer if the earth's horizontal field is known
(c) an oscillation magnetometer if the earth's horizontal field is known
(d) both deflection and oscillation magnetometer if the earth's horizontal field is not known
Two long bare magnets are placed with their axes coinciding in such a way that the north pole of the first magnet is 2.0 cm from the south pole of the second. If both the magnets have a pole strength of 10 Am, find the force exerted by one magnet of the other.
A magnetic dipole of magnetic moment `1.44 "A m"^2`is placed horizontally with the north pole pointing towards north. Find the position of the neutral point if the horizontal component of the earth's magnetic field is 18 μT.
Do permeability and relative permeability have the same dimensions?
The desirable properties for making permanent magnets are _________________ .
The magnetic field due to the earth has a horizontal component of 26 μT at a place where the dip is 60°. Find the vertical component and the magnitude of the field.
A magnetic needle is free to rotate in a vertical plane which makes an angle of 60° with the magnetic meridian. If the needle stays in a direction making an angle of `tan^-1(2sqrt(3))` with the horizontal, what would be the dip at that place?
A deflection magnetometer is placed with its arms in north-south direction. How and where should a short magnet having M/BH = 40 A m2 T−1 be placed so that the needle can stay in any position?
A short magnet oscillates in an oscillation magnetometer with a time period of 0.10 s where the earth's horizontal magnetic field is 24 μT. A downward current of 18 A is established in a vertical wire placed 20 cm east of the magnet. Find the new time period.
A bar magnet makes 40 oscillations per minute in an oscillation magnetometer. An identical magnet is demagnetized completely and is placed over the magnet in the magnetometer. Find the time taken for 40 oscillations by this combination. Neglect any induced magnetism.
A wire of length 2 m carrier of lamp is bend to form a circle. The magnetic moment of a coil is :-
