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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.
उत्तर
The instrument which makes use of the principle stated above is D.C. motor.
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संबंधित प्रश्न
Observe the following figure:
If the current in the coil A is changed, will some current be induced in the coil B? Explain.
State whether the following statement is true or false:
The magnetic field inside a long circular coil carrying current well be parallel straight lines.
Draw a sketch to show the magnetic lines of force due to a current-carrying straight conductor.
List three ways in which the magnetic field strength of a current-carrying solenoid can be increased?
A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid:
(a) will decrease
(b) will increase
(c) will become zero
(d) will remain the same
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
State two ways to increase the force on a current-carrying conductor in a magnetic field.
A magnetic field directed in north direction acts on an electron moving in east direction. The magnetic force on the electron will act ____________.
If the strength of the current flowing through a wire is increased, the strength of the magnetic field produced by it ______.
A copper conductor is placed over two stretched copper wires whose ends ate connected to a D.C. supply as shown in the diagram.
- What should be the magnetic poles at the points A and B lying on either side of the conductor to experience the force in the upward direction?
- Name the law used to find these polarities.
