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प्रश्न
The diagram shows a current-carrying coil passing through a cardboard sheet. Draw three magnetic lines of force on the board.
State two factors on which magnitude of magnetic field at the centre depends.
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उत्तर
Figure shows the magnetic lines of force due to current-carrying coil.
The magnitude of the magnetic field at the center of coil depends on:
(i) the strength of the current in the coil, and
(ii) the radius of coil.
संबंधित प्रश्न
State the direction in which current-carrying freely suspended solenoid rests
The adjacent diagram shows a small magnet placed near a solenoid AB. Current is switched on in the solenoid by pressing the key K.
- State the polarity at the ends A and B.
- Will the magnet be attracted or repelled? Give a reason for your answer.
Derive the expression for the heat produced due to a current ‘I’ flowing for a time interval ‘t’ through a resistor ‘R’ having a potential difference ‘V’ across its ends. With which name is the relation known? How much heat will an instrument of 12W produce in one minute if it is connected to a battery of 12V?
What is a solenoid? Why do we usually keep its diameter small in comparison to its length?
The magnetic field lines outside a bar magnet:
Which of the following diagrams correctly shows the magnetic field produced by a current-carrying wire?
The factors on which one magnetic field strength is produced by current-carrying solenoids depends are
Under what conditions permanent electromagnet is obtained if a current carrying solenoid is used? Support your answer with the help of a labelled circuit diagram.
A circuit contains a battery, a variable resistor and a solenoid. The figure below shows the magnetic field pattern produced by the current in the solenoid.
- State how the magnetic field pattern indicates regions where the magnetic field is stronger.
- What happens to the magnetic field when the current in the circuit is reversed?
When does a solenoid behave as a magnet? Draw the pattern of the magnetic field produced inside it showing the directions of the magnetic field lines.
