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प्रश्न
State the position of armature coil relative to the direction of magnetic field, in a D. C. motor when the deflecting couple acting an the coil is maximum.
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उत्तर
The deflecting couple acting on the coil is maximum when the plane of the coil is parallel to the direction of magnetic field.
संबंधित प्रश्न
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?
Tick the most appropriate answer.
Which of the following methods is used to magnetize a magnetic without touching it by a magnet?
Name and state the rule by which polarity at the ends of a current carrying solenoid is determined.
Name two factors on which the strength of magnetic field of an electromagnet depends and state how does it depend on the factors stated by you.
Describe briefly one way of producing an induced current in a coil. State one factor that determines the magnitude of induced e.m.f.
A straight current-carrying conductor is kept in a magnetic field. It Experiences a force. State three factors on which the magnitude of force Experienced by the conductor depends. Under what condition will the conductor Experience no force?
How does a magnetic field set up by a solenoid change when a soft iron core is inserted inside solenoid?
Point out three differences between an electromagnet and a bar (or permanent) magnet.
How does a magnetic field set up by a solenoid change when cross-sectional area of solenoid is increased?
Write the answer in your word.
How is an electromagnet made?
