| 1 |
In a coil current change from 2 to 4 A in .05 s . If the average induced emf is 8 V then coefficient of self-inductance is: |
0.2 henry
0.1 henry
0.8 henry
0.04 henry
|
| 2 |
The induced emf in a coil is proportional to: |
Magnetic flux through the coil
Rate of change of Magnetic flux through the coil
Area of the coil
Product of magnetic flux flux and area of the coil
|
| 3 |
What is the co-efficient of mutual inductance, when the magnetic flux changes by 2 x 10-2 Wb, and change in current is 0.01 A? |
2 H
3 H
1/2 H
Zero
|
| 4 |
The north pole of a magnet is brought near a metallic ring. The direction of induced current in the ring will be: |
Antoclockwise
Clockwise
First Clockwise and then Antoclockwise
First anticlockwise and then Clockwise
|
| 5 |
The device in which induced emf is statically induced emf is: |
Transforms
AC generator
Alevator
Dynamo
|
| 6 |
For inducing emf in a coil the basic requirement is that: |
Flux should link the coil
Change in flux should link the coil
Coil should form a closed loop
Both (b) and (c) are true
|
| 7 |
The unit of permiability of free space is: |
T.m/A
T.m<sup>2</sup>/A
T.m/A<sup>2</sup>
None of these
|
| 8 |
Ampere's law is applicable to: |
Circular path
Rectangular path
To any closed path
Nonwe of these
|
| 9 |
The force on a charge particle moving parallel to magnetic field is: |
Maximum
Minimum
Zero
None of these
|
| 10 |
An electron moves at 2 x 102 m/sec perpendicular to magnetic field of 2T what is the magnitude of magnetic force: |
1 x 10<sup>-6</sup> N
6.4 x 10<sup>-17</sup> N
3.6 x 10<sup>-24</sup> N
4 x 10<sup>6</sup> N
|
| 11 |
One weber is equal to: |
N.A <sup>2</sup>/m
N.m<sup>2</sup>/A
N.A/m
N.m/A
|
| 12 |
The Weber is unit of measure of: |
Conductance
Electric current
Magnitic flux
Electric flux
|
| 13 |
The magnetic flux will be max, For an angle of: |
0<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
60<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
90<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
180<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
|
| 14 |
The torque in the coil can be increased by increasing: |
No. of turns
Current and magnetic field
Area of coil
All of the above
|
| 15 |
When charge particle enter perpendicular to magnetic field, the path followed by it is: |
A helix
A circle
Straight line
Ellipes
|
| 16 |
Magnetism is related to: |
Stationary charges
Moving charges
Stationary & Movingcharges
Law of motion
|
| 17 |
A photon while passing thorugh a magnetic field are deflected towards: |
North pole
South pole
Are ionized
None of these
|
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