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प्रश्न
A flat coil ABCD is freely suspended between the pole of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field.
Name an instrument which makes use of the principle stated above.
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उत्तर
The instrument which makes use of the principle stated above is D.C. motor.
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संबंधित प्रश्न
The magnetic field inside a long straight solenoid-carrying current ______.
What concealed do you get from the observation that a current-carrying wire deflects a compass needle placed near it?
Fill in the following blank with suitable words:
For a current-carrying solenoid, the magnetic field is like that of a ...........
What are the various ways in which the strength of magnetic field produced by a current-carrying circular coil can be increased?
The front face of a circular wire carrying current behaves like a north pole. The direction of current in this face of circular wire is:
(a) clockwise
(b) downwards
(c) anticlockwise
(d) upwards
What happens when a current-carrying conductor is placed in a magnetic field?
A horizontal wire carries a current as shown in Figure below between magnetic poles N and S:
Is the direction of the force on the wire due to the magnet:
(a) in the direction the current
(b) vertically downwards
(c) opposite to the current direction
(d) vertically upwards
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.
A copper wire is held between the poles of a magnet
The current in the wire can be reversed. The pole of the magnet can also be changed over. In how many of the four directions shown can the force act on the wire?
