magnetism
Quiz
•
Physics
•
12th Grade
•
Practice Problem
•
Hard
mostafa sobhy
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The pointer of a galvanometer stops at a certain reading when the torsion in the two spring coils .......... The magnetic torque acting on the coil.
Is greater than
Equals
Is less than
Is in the same direction as
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a sensitive galvanometer,which of the following when decreased,the sensitivity of the galvanometer in measuring and electric current intensity increases?
The number of turns of the galvanometer coil
The area of the galvanometer coil
The magnetic field strength of the used magnet
The torsional constant of the two spring wires
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Two circular coils P and Q are made from similar wires but the radius and current of coil P is twice that of Q, if the magnetic flux density at their centers is the same, so the ratio between potential difference across circular coil P and the potential difference across circular coil
1:1
2:1
4:1
8:1
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A solenoid is connected to a battery in a closed circuit, if It's turns are compressed regularly. The ,magnetic flux density at a point on its axis inside it will..........
Increase
Decrease
Remain constant
Vanish
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The torque acting on a coil through which an electric current is flowing and placed in a magnetic field vanishes when the coil plane is makes ..........
An angel of 45 with field
An angel of 30 with field
An angel of 60 with field
An angel of 90 with field
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The resultant of the torque acting on the coil of the galvanometer when it's pointer became stable at a certain reading is equal to ......
BIAN
2BIAN
Zero
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When the intensity of the current passing through the coil of the galvanometer is doubled, the sensitivity of the device will .......
Remain constant
Increase to double
Decrease to half
Increase to 4 times
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