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प्रश्न
State qualitatively the effect of inserting an iron core into a current-carrying solenoid.
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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
The magnetic field in a given region is uniform. Draw a diagram to represent it.
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Name and state the rule to determine the direction of magnetic field around a straight current-carrying conductor.
What are the various ways in which the strength of magnetic field produced by a current-carrying circular coil can be increased?
What is a solenoid? Draw a sketch to show the magnetic field pattern produced by a current-carrying solenoid.
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.
In a statement of Fleming's left-hand rule, what do the following represent?
(a) direction of centre finger.
(b) direction of forefinger.
(c) direction of thumb.
For Fleming's left-hand rule, write down the three things that are 90° to each other, and next to each one write down the finger or thumb that represents it.
Name one device whose working depends on the force exerted on a current-carrying coil placed in a 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
What is the force on a current-carrying wire that is parallel to a magnetic field? Give reason for your answer.
State condition when magnitude of force on a current carrying conductor placed in a magnetic field is zero?
i) Which principle is explained in this figure?
ii) Which rule is used to find out the direction of a force in this principle?
iii) In which machine this principle is used? Draw a diagram showing working of that machine
State two ways to increase the speed of rotation of a D.C. motor.
Name and state the rule of determine the direction of force experienced by a current carrying straight conductor placed in a uniform magnetic field which is perpendicular to it.
State whether a magnetic field is associated or not around a moving charge.
The north pole of Earth’s magnet is in the ____________.
The strength of magnetic field around a current-carrying conductor is ____________.
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?
