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प्रश्न
State two ways to increase the speed of rotation of a D.C. motor.
उत्तर
By increasing the magnetic flux [by using strong magnet]
By reducing number of turns in the winding.
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संबंधित प्रश्न
State qualitatively the effect of inserting an iron core into a current-carrying solenoid.
Draw the magnetic lines of force due to a circular wire carrying current.
A current-carrying conductor is held in exactly vertical direction. In order to produce a clockwise magnetic field around the conductor, the current should passed in the conductor:
(a) from top towards bottom
(b) from left towards right
(c) from bottom towards top
(d) from right towards left
When is the force experienced by a current-carrying conductor placed in a magnetic field largest?
Name the following diagram and explain the concept behind it.
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
A current-carrying conductor is held in an exactly vertical direction. In order to produce a clockwise magnetic field around the conductor, the current should be passed in the conductor:
The strength of magnetic field around a current-carrying conductor is ____________.
When current is parallel to a magnetic field, then force experience by the current-carrying conductor placed in a uniform magnetic field is ____________.
