| 1 |
The direction of induced current is always so as to oppose the cause which produces it. This is |
Lenz's law
Ampere's law
Faraday's law
Coulomb's law
None of these
|
| 2 |
Faraday's law of electromagnetic induction has been used in the construction of: |
Galvanometer
Voltmeter
Electric motor
Electric genrator
Commutator
|
| 3 |
The law of electromagnetic induction is related to: |
Coulomb
Ampere
Faraday
Lenz
None of these
|
| 4 |
The rate change of area expressed is expressed in: |
None of these
ms<sup>-1</sup>
m<sup>2</sup>s<sup>-2</sup>
ms<sup>-2</sup>
m<sup>2</sup>s<sup>-1</sup>
|
| 5 |
Plan of a coil makes an angle of 20º with the lines of magnetic field. The angle between B and vector area of plane of coil is:
|
Also 20<span style="font-family: "Times New Roman", serif; font-size: 12pt; text-align: justify;">º</span><p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;
line-height:107%;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
70<span style="font-family: "Times New Roman", serif; font-size: 12pt; text-align: justify;">º</span><p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;
line-height:107%;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
90<span style="font-family: "Times New Roman", serif; font-size: 12pt; text-align: justify;">º</span><p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;
line-height:107%;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
180<span style="font-family: "Times New Roman", serif; font-size: 12pt; text-align: justify;">º</span><p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;
line-height:107%;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
None of these
|
| 6 |
A square loop of wire is moving through a uniform magnetic field. The normal to the loop is oriented parallel to the magnetic field. The emf induced in the loop is: |
Zero
Of smaller magnitude
Of larger magnitude
Sometimes B, sometimes C
Neither of these
|
| 7 |
A metal road of length 1m is moving at a speed of 1 ms-1In a direction making angle of 30º with 0.5 Y magnetic field. The emf produced in the rod is:
|
0.25 N
0.25 V
2.5 V
2.5 N
25 V
|
| 8 |
Motional emf is called motional: |
Electromagnetic force and is measured in newtons
Electromotive force and is measured in volt
Electromotive force and is measured in newtons
Electromagnetic force and is measured in volts
None of these
|
| 9 |
When the conductor moved across a magnetic field: |
Emf induced is similar to that of a battery<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;
line-height:107%;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
Emf induced gives rise to induced current<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;
line-height:107%;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
An emf induced across its ends<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;
line-height:107%;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
All are correct<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;
line-height:107%;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
None of these<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;
line-height:107%;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
|
| 10 |
A coil of constant area is placed in a constant magnetic field. An include current is produced in the coil when: |
The coil is destroyed
The coil is Rotated
The coil is neither destroyed nor rotated
Both (A) and (B)
None of these
|
| 11 |
The magnitude of induced emf depends upon the: |
Rate of decrease of magnetic field
Rate of change of magnetic field
Rate of increase of magnetic flux
Constancy of magnetic field
None of these
|
| 12 |
In magnet-coil experiment, emf can be produced by: |
Keeping the coil stationary and moving the magnet
Keeping the magnet stationary and moving the coil
Relative motion of the loop and magnet
Any one of above
All above
|
| 13 |
The induced current in the loop can be increased by: |
Using a stronger magnetic field
Moving the loop faster
Replacing the loop by a coil of many turns
All above
Both (A) and (B)
|
| 14 |
The induced current is a conductor depends upon: |
Resistance of the loop
Speed with which the conductor moves
Any of these
Both (A) and (B)
None of these
|
| 15 |
The phenomenon of generation of induced emf is called |
Electrostatic induction
Magnetic induction
Electromagnetic induction
Electric induction
Both (A) and (D)
|
| 16 |
An induced current can be produced by: |
Constant magnetic field
Changing magnetic field
Varying magnetic feild
Constant electric field
None of these
|
| 17 |
An emf is set up in a conductor when it: |
is kept in a magnetic field
is kept in a electric field
Move across a magnetic field
Both (A) and (B)
None of these
|
| 18 |
The current produced by moving a loop of a wire across a magnetic field is called: |
Direct current
Magnetic current
Alternating current
Induced current
None of these
|
| 19 |
When a conductoris moved across a magnetic field: |
Emf induced its similar to that of a battery
Emf induced gives rise to induced current
An emf is induced across its ends
All are correct
None of these
|
| 20 |
In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called: |
Induced emf
Both A and B
Both A and C
Motion emf
Electrostatic emf
|
| 21 |
In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called: |
Motion emf
Both A and B
Both A and C
Electrostatic emf
Induced emf
|
| 22 |
When a conductor is moved across a magnetic field, the redistribution of charge sets up: |
Magnetic field
Electrostatic field
Electromagnetic field
All of these
None of these
|
| 23 |
When a conductor moved with its length parallel to the lines of magnetic fled: |
An emf is induced across its ends
Emf induced is similar to that of a battery
Emf passes through the conductor
Both A and B
None of these
|
| 24 |
The product of induced current and the resistance of the wire through which the current is passing is called: |
Electromagnetic induction
induced emf
Induced current
Self induced
None of these
|
| 25 |
The unit of induced emf is: |
Volt
Nm/As
Joule coul<sup>-1</sup>
Both A and C
All of these
|
| 26 |
Referring to above figure, a changing current in coil P can be produced: |
At the instant the switch is closed
At the instant the switch is opened
With the help of rheostat
All of these
None of these
|
| 27 |
Referring to above figure, due to change in current in the coil P, the change in magnetic flux: |
Is associated with coil P
Is associated with coil S
Causes an induced current is coil S
All of these
None of these
|
| 28 |
Referring to above figure, current in coil P falls from its maximum value to zero: |
At the instant the switch is closed
At the instant the switch is opened
When switch is kept open
When switch is kept closed
None of these
|
| 29 |
Referring to above figure, current in the coil P grows from zero to its maximum value: |
At the instant the switch is closed
At the instant the switch is opened
When switch is kept open
All of above
Neither of above
|
| 30 |
A coil of constant area is placed in a constant magnetic field. An induced current is produced in the coil when: |
The coil is distorted
The coil is rotated
The coil is neither distorted nor rotated
Both A and B
None of these
|
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