| 1. | Magnetic lines of force inside current carrying solenoid are ? | |
|
circular.
|
||
|
along the axis and are parallel to each other.
|
||
|
perpendicular to axis.
|
||
|
parallel inside the solenoid and circular at the ends.
|
||
View Answer
Discuss in Forum
Report Question| 2. | When current is parallel to magnetic field, then force experience by the current carrying conductor placed in uniform magnetic field is ? | |
|
zero
|
||
|
infinite
|
||
|
Twice to that when angle is 60°
|
||
|
Thrice to that when angle is 60°
|
||
| 3. | When current is parallel to magnetic field, then force experience by the current carrying conductor placed in uniform magnetic field is ? | |
|
zero
|
||
|
infinite
|
||
|
Twice to that when angle is 60°
|
||
|
Thrice to that when angle is 60°
|
||
| 4. | By which instrument, the presence of magnetic field be determined ? | |
|
Ammeter
|
||
|
Galvanometer
|
||
|
Voltmeter
|
||
|
Magnetic Needle
|
||
| 5. | In electric motor, to make the coil rotating continuously in the same direction, current is reversed in the coil after every half rotation by a device called ? | |
|
armature
|
||
|
slip ring
|
||
|
commutator
|
||
|
carbon brush
|
||
| 6. | Who has stated the Right hand Thumb Rule ? | |
|
Einstein
|
||
|
Orsted
|
||
|
Maxwell
|
||
|
Fleming
|
||
| 7. | Which of the following statement is or are correct ? | |
|
Commutator rings reverse the direction of current flowing through the coil after every half rotation of the coil.
|
||
|
A motor works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it a force exerted on the coil which rotates it continuously.
|
||
|
A motor is a device which converts electrical energy to mechanical energy.
|
||
|
All the above.
|
||
| 8. | What happens to the current in short circuit ? | |
|
increases heavily
|
||
|
vary continuously
|
||
|
does not change
|
||
|
reduces substantially
|
||
| 9. | Which of the given correctly describes the magnetic field near a long straight wire ? | |
|
The field consists of concentric circles centred on the wire
|
||
|
The field consists of radial lines originating from the wire
|
||
|
The field consists of straight lines parallel to the wire
|
||
|
The field consists of straight lines perpendicular to the wire
|
||
| 10. | A TV set consumes an electric power of 230 watts and runs on 230 volts mains supply. The correct fuse for this TV set is ? | |
|
One A
|
||
|
Two A
|
||
|
Three A
|
||
|
Five A
|
||