Magnetic Field Due to Current Carrying Solenoid

Q. Which of the following statements is/are correct regarding a current-carrying solenoid?

1. The magnetic field lines outside a solenoid are in the form of parallel straight lines.
2. The magnetic field lines inside a solenoid are in the form of parallel straight lines.
3. The strength of the magnetic field increases with an increase in the current.
4. The strength of the magnetic field decreases with an increase in the current.

Q. What does the divergence of magnetic field lines near the ends of a current carrying straight solenoid indicate?

Q. 36. Consider energy density in a solenoid at its centre and that near its ends. Which of the two is greater ??

Q. A solenoid is 2.7 m long, has a radius 0.85 cm and has 600 turns. It carries a current i of 2.5 A. The magnitude of the magnetic field B inside the solenoid and far from the either end is

Q. A current I=1.5A going to a long solenoid of diameter 3.2 centimetre having 220 turns per centimetre. At its centre 130 turn closely coil of diameter 2.1 centimetre is placed such that the coil is coaxial with the long solenoid . the current in the solenoid is reduced to zero at a steady rate in 25ms. A) What is the magnitude of the EMF induced in the coil while the current in the solenoid is changing? B) Also find the EMF induced in the coil if it was positioned such that its plane contains the axis of the solenoid? C) what is the EMF induced when the current is reduced to zero and then increases again to 1.5 ampere in reverse direction in 25 ms?

Q. Q. A long solenoid has 200 turns per cm and carries a current I . The magnetic field at the centre is 6.28\ast10^{-2}Wbm^{-2}.Another long solenoid has 100 turns per cm and it carries a current I/3. The value of magnetic field at its centre is?

Q.

Name the material of an electromagnet.

Q. The magnetic field lines inside a long current carrying solenoid are parallel to each other.

1. True
2. False

Q. A copper wire having resis†an ce 0.01 ohm in each metre is used to wind a400 turn solenoid of radius 1 cm and length 20 cm. Find the emf of a battery when connected across the solenoid will cause a magnetic field of 10^- Tesla near the centre of the solenoid.

Q. What is the nature of magnetic field inside a solenoid?

1. Uniform
2. Non-uniform
3. Circular
4. Rectangular

Q. A solenoid that is carrying current has magnetic field lines similar to a bar magnet.

1. False
2. True

Q. The magnetic field lines inside a long current carrying solenoid are parallel to each other.

1. True
2. False

Q. The magnetic field lines inside a long current carrying solenoid are parallel to each other.

1. True
2. False

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.

Which of the following do not alter the strength of the magnetic field produced by a solenoid?

1. Insertion an iron core

2. Direction of current

3. Number of turns

4. Amount of current

Q. Which of the following statements is false regarding a current carrying solenoid?

1. The magnetic field strength of a solenoid can be altered.
2. Using soft iron as core in a solenoid increases its magnetic field strength.
3. The magnetic field produced by a current carrying solenoid is not similar to a bar magnet.
4. The polarity of a solenoid can be changed.

Q. An ideal solenoid of 1500 turns/m and radius 0.75 cm, changes its current at the uniform rate of 0.5 As^–1. Now consider a circle inside the solenoid of radius 0.5 cm whose axis coincides with that o solenoid.

Find the electric field induced on the circumference of the circle.

Q. A solenoid has a core of material with relative permeability 500 and its windings carry a current 1A.The no. of turns is 500 per metre.What is the magnetisation of the material?

Q.

A solenoid that is carrying current has magnetic field lines similar to that of ____.

1. a horse-shoe magnet

2. a bar magnet

3. any current carring conductor

4. a spherical magnet