Solenoid

Q.

Explain different ways to induce a current in a coil.

Q.

(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 carrent-carrying solenoid resembles.

(c) What is the shape of field lines inside a current-carrying solenoind ? 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 it into an electromagnet ?

Q.

In certain applications, electromagnets are better than permanent magnets because:
(more than one answers can be correct)

1. Electromagnets do not require electricity.

2. The strength of the magnetic field of an electromagnet can be controlled.

3. The polarity of an electromagnet can be reversed.

4. Electromagnets can be made to act as a magnet when needed.

Q.

State qualitatively the effect of inserting an iron core into a current-carrying solenoid.

Q. What is a galvanometer used for? Explain in brief the working of a galvanometer.

Q.

A long current carrying solenoid produces an uniform magentic field inside it.

1. True
2. False

Q.

A long current carrying solenoid produces an uniform magentic field inside it.

1. True
2. False

Q. Choose the correct statement about the magnetic field of a current carrying solenoid.

1. Field inside the solenoid is non-uniform and weak.
2. Field resembles the magnetic field of a horse-shoe magnet.
3. Field outside the solenoid is uniform and strong.
4. Field resembles the magnetic field of a bar magnet.

Q.

For a current in a long straight solenoid, N and S poles are created at the two ends. Among the following statements, the incorrect statement is:

1. The field lines in a solenoid, as well as a bar magnet form, closed loops

2. The strong magnetic field produced inside the solenoid can be used to magnetize a piece of magnetic material like soft iron when placed inside the coil

3. The magnetic field associated with the solenoid is different from the magnetic field around a bar magnet

4. The N- and S-poles exchange positions when the direction of current through the solenoid is reversed.

Q. If we double the number of turns per unit length for a solenoid, then the magnetic field along the axis of the solenoid ___________.

1. will decrease
2. will increase
3. cannot be predicted
4. will remain same

Q.

Draw the pattern of magnetic field lines of a current carrying solenoid. What does the pattern of field lines inside the solenoid indicate? Write one application of magnetic field of current carrying solenoid.

Q. what is the difference in the pattern of magnetic field due to a circular loop and inside a solenoid?

Q. Which magnet allows the reversibility of its poles?

1. Bar magnet
2. Disc magnet
3. Horseshoe magnet
4. Electromagnet

Q. 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.

Q.

Draw the magnetic field lines including the directions, due to a long current-carrying solenoid. Write the important features of the magnetic field obtained.

Q. Why outside solenoid magnetic fields is zero

Q. In what respect, is a toroid differentfrom a solenoid? Draw and comparethe pattern of the magnetic fieldlines in the two cases.THE

Q. why for a short thin solenoid the magnetic field at the end is unI/2 and at the centre is unI

Q. Why magnetic field outside solenoid is 0?

Q. Choose the correct statement from the following:
The strength of a solenoid can be increased by increasing the number of turns.
The magnetic field due to a solenoid is similar to the magnetic field produced by a bar magnet.

1. Only A is true
2. Only B is true
3. Both A and B are true
4. Both A and B are false

Q. the magnetic field outside a long solenoid is? why

Q.

Which of the following changes the strength of the magnetic field created by an electromagnet

1. Amount of current flowing through it

2. Changing the direction of current

3. Number of turns wound on the electromagnet.

4. None of the above

Q.

In the given diagram, if the arrow shows the direction of current then where will the north- pole is assumed to be

1. left end of solenoid.

2. right end of solenoid

3. centre of solenoid

4. none of these

Q. A long solenoid is shown in figure. If $B_A,B_B,B_C$and $B_D$ are magnetic fields at internal points $A,B$ , C and $D$ respectively. Then

1. $B_D>B_A$
2. All of these
3. $B_A>B_C$
4. $B_A=B_B=B_C$

Q. If we double the number of turns per unit length for a solenoid, then the magnetic field along the axis of the solenoid ___________.

1. will increase
2. will decrease
3. will remain same
4. cannot be predicted

Q. A solenoid has length 0.4 cm, radius 1 cm and 400 turns of wire. If a current of 5 A is passed through this solenoid, what is the magnetic field inside the solenoid?

1. $6.28\times {10}^{-1}T$
2. $6.28\times {10}^{-3}T$
3. $6.28\times {10}^{-2}T$
4. $6.28\times {10}^{-6}T$

Q.

The magnetic field of a current carrying solenoid is similar to the magnetic field of a?

1. Bar magnet

2. Current carried in a straight wire

3. Two current carrying conductors placed perpendicular to each other

4. Three current-carrying conductors placed perpendicular to each other.

Q. A solenoid of $2.5m$ length and $2.0cm$ diameter possesses $10$ turns per cm. A current of $0.5A$ is flowing through it. The magnetic induction at axis inside the solenoid is

1. $2\pi \times {10}^{-4}T$
2. $2\pi \times {10}^{-5}T$
3. $2\pi \times {10}^{-6}T$
4. $2\pi \times {10}^{-7}T$

Q.

Draw the pattern of magnetic field lines of a current carrying solenoid. What does the pattern of field lines inside the solenoid indicate? Write one application of magnetic field of current carrying solenoid. [5 MARKS]

Q. Identify the solenoid in the following figure:

1. 
2. 
3.