Advertisements
Advertisements
Question
A metallic loop is placed in a nonuniform magnetic field. Will an emf be induced in the loop?
Advertisements
Solution
According to Faraday's Law, an emf is induced in a loop when the magnetic flux through the loop changes. If the magnetic field is nonuniform, the flux through the loop changes as the position of the loop changes relative to the magnetic field or if the strength of the magnetic field varies over time. This change in flux induces an emf in the loop. Therefore, in a nonuniform magnetic field, there will be a change in magnetic flux through the loop, leading to the induction of an emf.
APPEARS IN
RELATED QUESTIONS
A square loop MNOP of side 20 cm is placed horizontally in a uniform magnetic field acting vertically downwards as shown in the figure. The loop is pulled with a constant velocity of 20 cm s−1 till it goes out of the field.
(i) Depict the direction of the induced current in the loop as it goes out of the field. For how long would the current in the loop persist?
(ii) Plot a graph showing the variation of magnetic flux and induced emf as a function of time.
The current flowing through an inductor of self inductance L is continuously increasing. Plot a graph showing the variation of
Magnetic flux versus the current
A pair of adjacent coils has a mutual inductance of 1.5 H. If the current in one coil changes from 0 to 20 A in 0.5 s, what is the change of flux linkage with the other coil?
An inductor is connected to a battery through a switch. Explain why the emf induced in the inductor is much larger when the switch is opened as compared to the emf induced when the switch is closed.
Calculate magnetic flux density of the magnetic field at the centre of a circular coil of 50 turns, having a radius of 0.5m and carrying a current of 5 A.
Answer the following question.
When a conducting loop of resistance 10 Ω and area 10 cm2 is removed from an external magnetic field acting normally, the variation of induced current-I in the loop with time t is as shown in the figure.
Find the
(a) total charge passed through the loop.
(b) change in magnetic flux through the loop
(c) magnitude of the field applied
The magnetic flux linked with the coil (in Weber) is given by the equation- Փ = 5t2 + 3t + 16. The induced EMF in the coil at time, t = 4 will be ______.
The unit of magnetic flux in SI is ______
A loop, made of straight edges has six corners at A(0, 0, 0), B(L, O, 0) C(L, L, 0), D(0, L, 0) E(0, L, L) and F(0, 0, L). A magnetic field `B = B_o(hati + hatk)`T is present in the region. The flux passing through the loop ABCDEFA (in that order) is ______.
A coil is placed in a time varying magnetic field. If the number of turns in the coil were to be halved and the radius of wire doubled, the electrical power dissipated due to the current induced in the coil would be: (Assume the coil to be short circuited.)
When every turn of a coil of \[N\] turns contributes equally, what is its magnetic flux linkage?
What condition is specified for using \[\Phi=NBA\cos\theta\] as the magnetic flux linkage of a coil?
What is the SI unit of magnetic flux?
Which equivalent unit of magnetic flux uses tesla and square metres?
What is the dimensional formula of magnetic flux?
What is the flux when the magnetic field is at an angle \[\theta\] to the area vector?
What is the flux when the magnetic field is perpendicular to the area vector?
When is magnetic flux zero relative to the plane of the surface?
