NEET Questions - Physics - Electromagnetic Induction and Alternating Currents

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Two different loops are concentric & lie in the same plane. The current in outer loop is clockwise & increasing withtime. The induced current in the inner loop then, is

clockwise
zero
counter clockwise
direction depends on the ratio of loop radii

A magnetic field $2 \times 10^{-2} T $ acts at right angles to a coil of area $200 cm^2$ with 25 turns. The average emf induced in the coil is 0.1 v when it removes from the field in time t. The value of t is

0.1 sec
1 sec
0.01 sec
20 sec

A coil has an area of $0.05 m^2$ & it has 800 turns. It is placed perpendicularly in a magnetic field of strength , $4 \times 10^{–5} Wb/m^{-2}$. It is rotated through $ 90 ^\circ $ in 0.1 sec. The average emf induced in the coil is...

0.056v
0.046v
0.026v
0.016v

A coil having n turns & resistance $ R \Omega $ is connected with a galvanometer of resistance $ 4 R \Omega $ . This combination is moved from a magnetic field $W_1 Wb$ to $W_2$ Wb in t second. The induced current in the circuit is....

$ -{ (W_2 -W_1) \over 5Rnt} $
$ -n{ (W_2 -W_1) \over 5Rt} $
$ -{ (W_2 -W_1) \over Rnt} $
$ -n{ (W_2 -W_1) \over Rt} $

When a train travels with a speed $360 km h^{-1} $ along the track separated by 1 meter. The vertical component of earth's magnetic field is $ 0.1 \times 10^{-4} T $ . What is the value of induced emf between the rails ?

$ 10^{-2} V $
$ 10^{-4} V $
$ 10^{-3} V $
1V

A circular loop of radius R carrying current I lies in X-Y plane with its centre at origin. The total magnetic flux through x-y plane is.....

Directly proportional to I
Directly proportional to R
Directly proportional to $R^2$
Zero

Two similar circular loops carry equal currents in the same direction.On moving the coils further apart, the electric current will

Remain unchanged
Increasing in both
Increasing in one decreasing in other
Decreasing in both

When the number of turns in a coil is make four time without anychange in length of the coil, its self inductance becomes......

unchanged
two times
four times
sixteen times

A metal rod moves at a constant velocity in a direction perpendicular to its length & a constant uniform magnetic field too. Select the correct statement (s) from the following.

The entire rod is at the same electrical potential
There is an electric field in the rod
The electric potential is highest at the centre of the rod.
The electric potential is lowest at the centre of the rod.

Two co-axial solenoids are made by a pipe of cross sectional area $10 cm^2$ and length 20 cm If one of the solenoid has 300 turns and the other 400 turns, their mutual inductance is........

$ 4.8 \phi \times 10^{-4} H $
$ 4.8 \phi \times 10^{-5} H $
$ 2.4 \phi \times 10^{-4} H $
$ 4.8 \phi \times 10^{4} H $

The self inductance of a straight conductor is…

Zero
Very Large
Very Small
$ \infty $

Two coils of self inductances 2 mH & 8 mH are placed so close togather that the effective flux in one coil is completely half with the other.The mutual inductance between these coils is.......

4 mH
6 mH
2 mH
16 mH

In circular coil. when no. of turns is doubled & resistance becomes half of the initial then inductance becomes

4 times
2 times
8 times
No change

A transformer of efficiency 90% draws an input power of 4 kW. An electrical applience connected across the secondary draws a current of 6 A. The impedence of device is.........

$ 60 \Omega $
$ 50 \Omega $
$ 80 \Omega $
$ 100 \Omega $

The armature of dc motor has $ 20 \Omega $ resistance. It draws current of 1.5 A when run by 220 V dc suppy. The value of back induced in it will be

150v
190v
170v
180v

NEET Physics Questions: Electromagnetic Induction and Alternating Currents