Advertisements
Advertisements
प्रश्न
State two ways to increase the speed of rotation of a D.C. motor.
Advertisements
उत्तर
By increasing the magnetic flux [by using strong magnet]
By reducing number of turns in the winding.
APPEARS IN
संबंधित प्रश्न
State qualitatively the effect of inserting an iron core into a current-carrying solenoid.
Fill in the following blank with suitable words:
For a current-carrying solenoid, the magnetic field is like that of a ...........
Draw a sketch to show the magnetic lines of force due to a current-carrying straight conductor.
What is the shape of field lines inside a current-carrying solenoid? What does the pattern of field lines inside a current-carrying solenoid indicate?
In the simple electric motor of figure given below, the coil rotates anticlockwise as seen by the eye from the position X when current flows in the coil
Is the current flowing clockwise or anticlockwise around the coil when viewed from above?
The following diagram shows two parallel straight conductors carrying the same current. Copy the diagram and draw the pattern of the magnetic field lines around them showing their directions. What is the magnitude of the magnetic field at a point 'X' which is equidistant from the conductors? Give justification for your answer.
The strength of magnetic field around a current-carrying conductor is ____________.
Observe the given figure of Fleming's Left Hand Rule and write the labels of 'A' and 'B':
Assertion (A): A current carrying straight conductor experiences a force when placed perpendicular to the direction of magnetic field.
Reason (R): The net charge on a current carrying conductor is always zero.
If the strength of the current flowing through a wire is increased, the strength of the magnetic field produced by it ______.
