What is a solenoid ?

Academic Physics NCERT Class 7

A solenoid is a type of electromagnet. Electromagnets generate a magnetic field when electricity is passed through them.

A solenoid is just a coil of wire in a cylindrical shape.

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Updated on: 10-Oct-2022

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What is a solenoid? Draw the pattern of magnetic field lines of a solenoid through which a steady current flows. What does the pattern of field lines inside the solenoid indicate?
(a) What is a solenoid? Draw a sketch to show the magnetic field pattern produced by a current-carrying solenoid.(b) Name the type of magnet with which the magnetic field pattern of a current-carrying solenoid resembles. (c) What is the shape of field lines inside a current-carrying solenoid? What does the pattern of field lines inside a current-carrying solenoid indicate? (d) List three ways in which the magnetic field strength of a current-carrying solenoid can be increased? (e) What type of core should be put inside a current-carrying solenoid to make an electromagnet?
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What is a solenoid? Draw the pattern of magnetic field lines of (i) a current-carrying solenoid and (ii) a bar magnet. List two distinguishing features between the two fields.
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Bar Magnet As An Equivalent Solenoid
A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid:(a) will decrease (b) will increase(c) will become zero (d) will remain the same
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.
How does a solenoid behave like a magnet? Can you determine the north and south poles of a current–carrying solenoid with the help of a bar magnet? Explain.
If the direction of electric current in a solenoid when viewed from a particular end is anticlockwise, then this end of solenoid will be:(a) west pole (b) south pole (c) north pole (d) east pole
State qualitatively the effect of inserting an iron core into a current-carrying solenoid
Give reasons for the following :(i) There is either a convergence or a pergence of magnetic field lines near the ends of a current-carrying straight solenoid.(ii) The current-carrying solenoid when suspended freely rests along a particular direction.(iii) The burnt-out fuse should be replaced by another fuse of identical rating.
The magnetic field inside a long straight solenoid carrying current:(a) is zero (b) decreases as we move towards its end. (c) increases as we move towards its end. (d) is the same at all points.

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