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प्रश्न
State two ways to increase the speed of rotation of a D.C. motor.
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उत्तर
By increasing the magnetic flux [by using strong magnet]
By reducing number of turns in the winding.
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संबंधित प्रश्न
The magnetic field in a given region is uniform. Draw a diagram to represent it.
State Fleming’s left-hand rule.
Which of the following correctly describes the magnetic field near a long straight wire?
Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by a strong magnetic field to your right side. What is the direction of magnetic field?
State Fleming’s left hand rule.
Describe how you will locate a current-carrying wire concealed in a wall.
List three ways in which the magnetic field strength of a current-carrying solenoid 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
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 under what conditions force acting on a current carrying conductor which is freely suspended in a magnetic field can be Zero.
