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Magnetic Field Due to Current in a Solenoid

In which form...

Question

In which form the field lines inside the infinite solenoid are present ?

A

Perpendicular straight lines

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B

Circular lines

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C

Ellipsoidal lines

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D

Parallel straight lines

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Solution

The correct option is D Parallel straight lines
The field lines inside the infinite solenoid are in the form of parallel straight lines. Since it is a infinite one, one can't find a edge of it where the field lines can bend.

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Q. The magnetic field lines inside the solenoid are in the form of

Q. Question 4
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

(a) The field lines inside the solenoid are in the form of straight lines which indicates that the magnetic field is the same at all points inside the solenoid
(b) The strong magnetic field produced inside the solenoid can be used to magnetise a piece of magnetic material like soft iron, when placed inside the coil
(c) The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet
(d) The N- and S-poles exchange position when the direction of current through the solenoid is reversed

Q. Assertion: Magnetic field inside a solenoid is in straight lines but while coming out of a solenoid, they diverge and move far apart.

Reason: The magnetic field is maximum inside a solenoid and starts to decrease as we move away from the solenoid.

Q. The equation of line on which magnetic field is zero due to system of two perpendicular infinitely long current carrying straight wires, is

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