Advertisements
Advertisements
Question
State the energy change that takes’place in a D. C. motor.
Advertisements
Solution
The energy change that takes place in a D. C. motor is from electrical energy into mechanical energy.
APPEARS IN
RELATED QUESTIONS
The diagram shows a coil wound around a U shape soft iron bar AB.
1) What is the polarity induced at the ends A and B when the switch is pressed?
2) Suggest one way to strengthen the magnetic field in the electromagnet
3) What will be the polarities at A & B if the direction of current is reversed in the circuit?
How will you make an iron bar electromagnet? Draw a diagram showing the polarities of the electromagnet?
Suppose you are given a long bar magnet and you are asked to break it into four small magnets. Draw diagrams showing the polarities of each broken part.
How does a magnetic field set up by a solenoid change when strength of current in the solenoid is decreased?
What is a permanent magnet? Give one use of it.
State the factors that can increase the speed of rotation of the coil in a D.C. motor.
State important properties (or characteristics) of magnetic lines of force around a straight conductor.
State the factors, on which depends the magnitude of the force acting on current carrying conductor, when it is kept in a magnetic field perpendicular to it.
State and explain Maxwell’s Cork Screw Rule.
Write the answer in your word.
How is an electromagnet made?
