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Magnetic Field Due to Current in a Solenoid

The magnetic ...

Question

The magnetic field in a given region is uniform. Draw a diagram to represent it.

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Solution

Uniform magnetic field is represented by parallel magnetic field lines in same direction.
The magnetic field lines inside a current-carrying long straight solenoid are uniform.

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The magnetic field in a given region is uniform. Draw a diagram to represent it.

Draw the magnetic field lines representing the uniform magnetic field.

Q. Sometimes we show an idealised magnetic field which is uniform in a given region and falls to zero abruptly. One such field is represented in figure. Using Ampere's law over the path PQRS, show that such a field is not possible.

Q. Refer to the figure, rectangle

P Q R S

represents the cross section of a uniform magnetic field region of

0.20 T

. An electron is projected at a speed of

v = 2.0 \times 10^{6} m / s

into the region at an angle of

30^{\circ}

to the direction of the magnetic field. The length of the magnetic field region is

0.01 m

. Find the number of revolutions made by the electron before it leaves the magnetic field region.

Q. Refer to the figure ,rectangle PQRS represents the cross section of a uniform magnetic field region of 0.20 T.An electron is projected at a speed of v=

2.0 \times 10^{6} m / s

into the region at an angle of

30^{0}

to the direction of the magnetic field .The length of the magnetic field region

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