| 1. | Lorentz force is ? | |
|
the vector sum of gravitational and magnetic force acting on a moving charged particle.
|
||
|
the vector sum of electrostatic and magnetic force acting on a moving charged particle.
|
||
|
magnetic force acting on a moving charged particle.
|
||
|
electrostatic force acting on a charged particle.
|
||
View Answer
Discuss in Forum
Report Question| 2. | An electric charge in uniform motion produces ? | |
|
a magnetic field only
|
||
|
both electric and magnetic fields
|
||
|
an electric field only
|
||
|
no such field at all
|
||
| 3. | Two parallel wires carrying currents in the same direction attract each other because of ? | |
|
magnetic forces between them
|
||
|
electric forces between them
|
||
|
mutual inductance between them
|
||
|
potential difference between them
|
||
| 4. | Cyclotron is used to accelerate ? | |
|
negative ions
|
||
|
neutrons
|
||
|
electrons
|
||
|
positive ions
|
||
| 5. | The deflection in a moving coil galvanometer is ? | |
|
directly proportional to the number of turns in the coil
|
||
|
inversely proportional to the current flowing
|
||
|
inversely proportional to the area of the coil
|
||
|
directly proportional to the torsional constant
|
||
| 6. | A milli voltmeter of 25 milli volt range is to be converted into an ammeter of 25 ampere range. The value (in ohm) of necessary shunt will be ? | |
|
0.01
|
||
|
0.001
|
||
|
0.05
|
||
|
1
|
||
| 7. | A charged particle moves through a magnetic field in a direction perpendicular to it. Then the ? | |
|
acceleration remains unchanged
|
||
|
direction of the particle remains unchanged
|
||
|
speed of the particle remains unchanged
|
||
|
velocity remains unchanged
|
||
| 8. | If a copper rod carries a direct current, the magnetic field associated with the current will be ? | |
|
neither inside nor outside the rod
|
||
|
only outside the rod
|
||
|
only inside the rod
|
||
|
both inside and outside the rod
|
||
| 9. | A moving coil galvanometer can be converted into an ammeter by ? | |
|
introducing a resistance of large value in parallel.
|
||
|
introducing a resistance of small value in series.
|
||
|
introducing a shunt resistance of small value in parallel.
|
||
|
introducing a shunt resistance of large value in series.
|
||
| 10. | A charged particle is moving on circular path with velocity v in a uniform magnetic field B, if the velocity of the charged particle is doubled and strength of magnetic field is halved, then radius becomes ? | |
|
16 times
|
||
|
2 times
|
||
|
4 times
|
||
|
8 times
|
||