  Types Of Questions

## Electromagnetic Induction

- Wondering what kind of questions that can be asked in next exam? Here you go!
1
Single Correct
The induced e.m.f.in the frame only due to the variation of magnetic field will be
A
0.3 V
B
0.1 V
C
0.5 V
D
0.4 V
A wire as a parabola is located in a uniform magnetic field of inductance B perpendicular to the XY plane. At t=0 a connection starts translation wise from the parabola apex with constant acceleration . The induced emf in the loop, thus formed, as a function of y is:
A
B
C
D
An annular circular brass disk of inner radius and outer radius is rotating about an axis passing through its center and perpendicular to its plane with a uniform angular velocity in a uniform magnetic field of induction normal to the plane of the disk. The induced emf between the inner and the  outer edge of the annular disk is :
A
B
C
D
2
Multiple Correct
A wire shaped as a semicircle of radius a is rotating about an axis PQ with a constant angular velocity , with the help of an external agent. A uniform magnetic field B exists in space and is directed into the plane of the figure. (circuit part remains at rest (left part is at rest) ) . Then,
This question has multiple correct options
A
the rms value of current in the circuit is
B
the rms value of current in the circuit is
C
the maximum energy stored in the capacitor is
D
the maximum power delivered by the external agent is
A conducting rod of length is hinged at point O. It is free to rotate in a vertical plane. There exists a uniform magnetic field in horizontal direction. The rod is released from the position shown. The potential difference between the two ends of the rod is proportional to:
This question has multiple correct options
A
B
C
D
An infinitely long wire is placed near a square loop as shown in the figure. Choose the correct options.
This question has multiple correct options
A
The mutual inductance between the two is
B
The mutual inductance between the two is
C
If a constant current is passed in the straight wire in upward direction and loop is brought close to the wire then induced current in the loop is clockwise
D
In the above condition, induced current in the loop is anticlockwise
3
Numerical Type I
What is the potential difference in Volts across the inductor ?
The conducting rod , as shown in figure makes contact with metal rails and . The apparatus is in a uniform magnetic field of , perpendicular to the plane of the figure. Compare the rate at which mechanical work done by the force with the rate at which thermal energy is developed in the circuit ().(in )
4
Numerical Type II
In the figure there are two identical conducting rods each of length rotating with angular speed in the directions shown. One end of each rod touches a conducting ring. Magnetic field exists perpendicular to the plane of the rings. The rods, the conducting rings and the lead wires are resistanceless. Find the magnitude and direction of current in the resistance .
A inductor is placed in series with a resistor. An emf of is then suddenly applied across the combination. At after the emf is applied what is the rate at which energy is being delivered by the battery?
5
Matrix Match Type I
In column I, some circuits are given. In all the circuits except in (i), switch S remains closed for a long time and then it is opened at ; while for (i), the situation is reversed. Column II tells something about the circuit quantities. Match the entries of column I with the entries of column II.
List 1    List 2Induced emf can be greater than E.Induced emf would be less than E.Finally, energy stored in inductor is zero.Finally, energy stored in inductor is non-zero.
Column I shows the cylindrical region of radius where a downward magnetic field exists, where is increasing at the rate of . A rod is placed in different situation as shown. Match the column I with the current statement in column II regarding the induced emf in rod.
List 1    List 2Induced emf in rod is Induced emf in rod is less than End is positive with respect to point End is positive with respect to point
6
Matrix Match Type II
A frame ABCD is rotating with an angular velocity about an axis passing through the point O perpendicular to the plane of paper as shown in fig 4.212. A uniform magnetic field is applies into the plane of paper in the region as shown below. Match the following.

List 1Potential differences between A and O isPotential differences between O and D isPotential differences between C and D isPotential differences between A and D is
List 2zeroconstant
The switch S in the circuit is connected with point a for a very long time, then it is shifted to position b. The resulting current through the inductor is shown by curves in the graph for four sets of values for the resistance R and inductance L (given in column 1). Which set corresponds with which curve?
List 1 and and and and
List 2IIIIIIIV
7
Passage Type
Charge (in C) on capacitor as a function of time is
A
B
C
D
Maximum current in the inductor coil at any time is :
A
B
C
D