Electromagnetism Set 1

Results

#1. The shape of magnetic field around a long straight current carrying wire is a) b) c) d)

Electrical

Squire

Varies with current

Circular

#2. The electrons of mass "m" and charge "e" is moving in a circle of radius "r" with speed "v" in a uniform magnetic field of strength "B" then

rxm

rx B

rx 1/v

rx 1/m

#3. The toque in the coil can be increased by increasing:

Number of turns

Current and magnetic field

Area of coil

All of above

#4. A current carrying loop, when placed in Uniform magnetic field will experience a) b) c) d)

Electric flux

Torque

Magnetic flux

Force

#5. It is possible to set a charge at rest into motion with magnetic field:

Yes

Sometime

None

#6. The grid in CRO:

Controls the number of electrons accelerated by anode

Controls the brightness of the spot fall on the screen

Both a and b

Deflects the beam of electrons

#7. The magnetic flux will be maximum if the angle between magnetic field strength and vector area is:

90°

180°

#8. One weber is equal to:

N.A*2/A

N.m*2/A

N.A/m

N.m/A

#9. The waveform of sinusoidal voltage, its frequency and phase can be found by:

CRO

Diode

Transistor

Radio

#10. The force on a charge particle moving parallel to magnetic field is:

Maximum

Minimum

Zero

None

Finish