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प्रश्न
State qualitatively the effect of inserting an iron core into a current-carrying solenoid.
उत्तर
If an iron core is inserted into a current carrying solenoid, it acts as a magnet. If we switch off the current in the solenoid, magnetism of the soft iron core disappears.
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संबंधित प्रश्न
State Fleming’s left-hand rule.
When is the force experienced by a current-carrying conductor placed in a magnetic field largest?
A current-carrying straight wire is held in exactly vertical position. If the current passes through this wire in the vertically upward direction, what is the direction of magnetic field produced by it? Name the rule used to find the direction of magnetic field.
A current flows in a wire running between the S and N poles of a magnet lying horizontally as shown in Figure below:
The force on the wire due to the magnet is directed:
fron N to S
from S to N
vertically downwards
vertically upwards
Name and state the law which is used to determine the direction of force on a current carrying conductor placed in a magnetic field.
A flat coil ABCD is freely suspended between the pole pieces of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field.
When will the couple acting on the coil be
- maximum
- minimum?
Describe the activity that shows that a current-carrying conductor experiences a force perpendicular to its length and the external magnetic field. How does Fleming’s left-hand rule help us to find the direction of the force acting on the current carrying conductor?
A simple motor is made in a school laboratory. A coil of wire is mounted on an axle between the poles of a horseshoe magnet, as illustrated.
In the example above, coil ABCD is horizontal and the battery is connected as shown.
- For this position, state the direction of the force on the arm AB.
- Why does the current in the arm BC not contribute to the turning force on the coil?
Which of the following pattern correctly describes the magnetic field around a long straight wire carrying current?
