Faraday's Law Of Induction - Practice Questions & MCQ

The flux linked with a coil at any instant t is given by = 10t² - 50t + 250. The induced emf (in Volts) at t = 3s is

The figure shows three regions of the magnetic field, each of area A, and in each region magnitude of the magnetic field decreases at a constant rate a. If  $\overrightarrow{E}$ is an induced electric field then the value of the line integral $\oint \overrightarrow{E}\cdot d\overrightarrow{r}$ Along the given loop is equal to:

A small circular loop of wire of radius a is located at the center of a much larger circular wire loop of radius b.  The two loops are in the same plane. The outer loop of radius b carries an alternating current I=I_o cos (ωt).  The emf induced in the smaller inner loop is nearly :

In the figure shown a square loop PQRS of side 'a' and resistance 'r' is placed near an infinitely long wire carrying a constant current I. The sides PQ and RS are parallel to the wire. The wire and the loop are in the same plane. The loop is rotated by 180º about an axis parallel to the long wire and passing through the midpoints of the side QR and PS. The total amount of charge which passes through any point of the loop during rotation is  :

The magnetic induction at the centre O in Fig shown is

A coil is placed in magnetic field such that plane of coil is perpendicular to the direction of magnetic field. The magnetic flux through a coil can be changed:

A. By changing the magnitude of the magnetic field within the coil.

B. By changing the area of coil within the magnetic field.

C. By changing the angle between the direction of magnetic field and the plane of the coil.

D. By reversing the magnetic field direction abruptly without changing its magnitude.

Choose the most appropriate answer from the options given below :

According to the 'Flemings left hand rule' direction of motion of charge is indicated by the direction of-

When a conducting loop is moved in a magnetic field then the total charge induced depends on -

A conducting circular loop is placed in a uniform magnetic field $0.4\mathrm{T}$ with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at $1\mathrm{mm}{\mathrm{s}}^{-1}$. The induced emf in the loop when the radius is $5\mathrm{cm}$ is:

A circular coil expands radially in a region of magnetic field and no electromotive force is produced in the coil. This can be because
(a) the magnetic field is constant.
(b) the magnetic field is in the same plane as the circular coil and it may or may not vary.
(c) the magnetic field has a perpendicular (to the plane of the coil) component whose magnitude is decreasing suitably.
(d) there is a constant magnetic field in the perpendicular (to the plane of the coil) direction.