Advertisements
Advertisements
प्रश्न
A coil of 200 turns carries a current of 0.4 A. If the magnetic flux of 4 mWb is linked with each turn of the coil, find the inductance of the coil.
Advertisements
उत्तर
Given data:
N = 200
i = 0.4 A
ΦB = 4 mWb = 4 × 10-3 Wb
L = ?
NΦBi = Li
L = `("N"phi_"B")/"i"`
L = `(200 xx 4 xx 10^-3)/0.4`
`= (cancel(200) xx cancel(40) xx 10^-3)/cancel(4)`
L = 2H
APPEARS IN
संबंधित प्रश्न
What is electromagnetic induction?
Explain why, the core of an electromagnet should be of soft iron and not of steel.
State whether the following statement are true or false:
A motor works on the principle electric generator?
An induced current is produced when a magnet is moved into a coil. The magnitude of induced current does not depend on:
(a) the speed with which the magnet is moved
(b) the number of turns of the coil
(c) the resistivity of the wire of the coil
(d) the strength of the magnet
A conducting square loop having edges of length 2.0 cm is rotated through 180° about a diagonal in 0.20 s. A magnetic field B exists in the region which is perpendicular to the loop in its initial position. If the average induced emf during the rotation is 20 mV, find the magnitude of the magnetic field.
Can a transformer work when it is connected to a D.C. source? Give a reason.
List some of the practical applications of an electromagnet.
A coil of one turn is made of a wire of certain length and then from the same length, a coil of two turns is made. If the same current is passed in both the cases, then the ratio of the magnetic inductions at their centres will be:
A current I = 10 sin(100π t) A is passed in first coil, which induces a maximum e.m.f of 5π volt in second coil. The mutual inductance between the coils is ______.
What is a solenoid?
