10th Grade > Physics
MAGNETIC EFFECTS OF ELECTRIC CURRENT MCQs
Total Questions : 30
| Page 2 of 3 pages
Answer: Option C. ->
Velocity
:
C
When a proton enters a uniform magnetic field, it starts to move in a circular manner. We know that the velocity of the particle changes when it undergoes circular motion as the direction is always changing. Hence, the velocity of the proton changes when it enters into a magnetic field.
:
C
When a proton enters a uniform magnetic field, it starts to move in a circular manner. We know that the velocity of the particle changes when it undergoes circular motion as the direction is always changing. Hence, the velocity of the proton changes when it enters into a magnetic field.
Answer: Option B. ->
DC generator has a commutator.
:
B and D
An AC generator produces alternating current and it has slip rings. while a DC generator has a commutator ring which keeps the current flow in the same direction.
:
B and D
An AC generator produces alternating current and it has slip rings. while a DC generator has a commutator ring which keeps the current flow in the same direction.
Answer: Option B. ->
The direction of the current is parallel to the magnetic field.
:
B
:
B
When a current-carrying conductor is placed in a magnetic field, a force is exerted on the conductor. The direction of this force is perpendicular to both the direction of current as well as the direction of the magnetic field (Fleming's left-hand rule).
The conductor will not experience a force if the angle between the current and the magnetic field is 0∘ or 180∘, i.e., parallel. In all other cases, it experiences a force.
Answer: Option C. ->
1 - North, 2- North
:
C
Magnets have two poles i.e north pole and south pole. Like poles of magnets repel each other and unlike poles attract each other. It is given that the magnets repel each other. From this, we can infer that the poles facing each other would be north-north or south-south.
:
C
Magnets have two poles i.e north pole and south pole. Like poles of magnets repel each other and unlike poles attract each other. It is given that the magnets repel each other. From this, we can infer that the poles facing each other would be north-north or south-south.
Answer: Option A. ->
True
:
A
:
A
Any change in the magnetic environment of a coil of wire will cause a voltage (emf) to be "induced" in the coil. No matter how the change is produced, the voltage will be generated. The change could be produced by changing the magnetic field strength, moving a magnet toward or away from the coil, moving the coil into or out of the magnetic field, rotating the coil relative to the magnet, etc.
Answer: Option C. ->
the bar magnet is kept stationary
:
C
:
C
An emf would be induced in the coil if there is a change in the magnetic flux. This can happen if the bar magnet and the coil move relative to each other i.e. if the bar magnet moves towards/away from the coil or the coil moves towards/away from the bar magnet. But if neither the bar magnet nor the coil moves then the induced current is zero.
Answer: Option B. ->
False
:
B
Live wire has red insulation cover, whereas the earth wire has green insulation colour in the domestic circuits.
:
B
Live wire has red insulation cover, whereas the earth wire has green insulation colour in the domestic circuits.
Answer: Option C. ->
magnetic field
:
C
According to the right-hand thumb rule, if you are holding a current carrying conductor with the right hand in such a way, that the thumb points in the direction of the current then the direction in which the other fingers encircle the conductor gives the direction of the magnetic field.
:
C
According to the right-hand thumb rule, if you are holding a current carrying conductor with the right hand in such a way, that the thumb points in the direction of the current then the direction in which the other fingers encircle the conductor gives the direction of the magnetic field.
Answer: Option C. ->
magnetic effect of current
:
C
:
C
MCBs are used in houses to protect the household wiring from excessive flow of electric current through it. If the current becomes too large, the miniature circuit breaker puts off the switch, cutting off the electric supply. The MCB can be reset when the fault has been corrected. MCB contains an electromagnet which becomes strong enough to separate a pair of contacts and thus breaks the circuit when the current exceeds the rated value. So, MCBs work on the magnetic effect of electric current.
Answer: Option B. ->
increase
:
B
A solenoid is a long coil containing a large number of close turns of insulated copper wire. The strength of the magnetic field produced by a current carrying solenoid depends on the nature of the core material used in making it. The use of soft iron rod as the core increases the magnetic field produced by it.
:
B
A solenoid is a long coil containing a large number of close turns of insulated copper wire. The strength of the magnetic field produced by a current carrying solenoid depends on the nature of the core material used in making it. The use of soft iron rod as the core increases the magnetic field produced by it.
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