Advertisements
Advertisements
प्रश्न
State important properties (or characteristics) of magnetic lines of force around a straight conductor.
Advertisements
उत्तर
The main properties are:
(i) The magnetic lines of force are in the form of concentric circles around the conductor but as their distance from the conductor increases, the curvature of lines of force decreases.
(ii) The direction of the magnetic lines of force reverses if the direction of the flow of current in the conductor reverses.
(iii) With the increase of current in the conductor, the number of lines of force or the intensity of the magnetic field also increases.
संबंधित प्रश्न
The diagram shows a coil wound around a U-shaped soft iron bar AB.
- What is the polarity induced at the ends A and B when the switch is pressed?
- Suggest one way to strengthen the magnetic field in the electromagnet.
- What will be the polarities at A and B if the direction of current is reversed in the circuit?
State three uses of an electromagnet?
Name the material used for making the armature of an electric bell. Give a reason for your answer.
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?
State the purpose of the iron core.
How does a magnetic field set up by a solenoid change when number of turns are increased?
How does a magnetic field set up by a solenoid change when a soft iron core is inserted inside solenoid?
State the position of armature coil relative to the direction of magnetic field, in a D. C. motor when the deflecting couple acting and the coil is minimum.
Point out three differences between an electromagnet and a bar (or permanent) magnet.
Write the answer in your words.
How is an electromagnet made?
