Advertisements
Advertisements
प्रश्न
What is the function of uniform radial field and how is it produced?
उत्तर
In uniform radial field sinα = 1, so the torque acting on the coil will always be τ = nIBA (maximum).
To produce radial magnetic field pole pieces of permanent magnets are made cylindrical and a soft iron core is placed between them. The soft iron core helps in making the field radial.
APPEARS IN
संबंधित प्रश्न
What is the amount of work done in moving a point charge Q around a circular arc of radius ‘r’ at the centre of which another point charge ‘q’ is located?
The field lines of a negative point charge are as shown in the figure. Does the kinetic energy of a small negative charge increase or decrease in going from B to A?
Why must electrostatic field at the surface of a charged conductor be normal to the surface at every point? Give reason?
The bob of a simple pendulum has a mass of 40 g and a positive charge of 4.0 × 10−6 C. It makes 20 oscillations in 45 s. A vertical electric field pointing upward and of magnitude 2.5 × 104 NC−1 is switched on. How much time will it now take to complete 20 oscillations?
The intensity of the electric field at a point at a perpendicular distance ‘r’ from an infinite line charge, having linear charge density ‘λ’ is given by:
An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is ______.
A charge Q is placed at the centre of the line joining two point charges +q and +q as shown in the figure. The ratio of charges Q and q is ______.
Electric field at a point varies as r° for ______.
Two equal point charges of the same sign are fixed on the y-axis, on either side of the origin equidistant from it, with the distance between them d. A third charge moves along the x-axis. The distance of the third charge from either of the two fixed charges when force on the third charge is maximum will be ______ cm.
[d = 10 cm]
