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Q.

A beam of alpha – particles projected along $+ x axis$ experiences a force due to magnetic field along the $+ y axis$ . The direction of the magnetic field is:

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a

+ x axis

b

- z axis

c

+ z axis

d

+ y axis

answer is B.

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Detailed Solution

A beam of alpha – particles projected along

+ x axis

experiences a force due to magnetic field along the

+ y axis

. The direction of the magnetic field is

- z axis

.
Magnetic field is the region in which electric charge experience magnetic influence. Due to the magnetic field, the moving charges experience force acting on them. The direction of force is perpendicular to the velocity and to the magnetic field.
The force is given by

F = q (v \times B)

So, from this formula, we get that the magnetic field will be along

z axis

. Using Fleming’s left-hand rule, we can get that the magnetic is along

- z axis

.

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A beam of alpha – particles projected along +x axis experiences a force due to magnetic field along the +y axis. The direction of the magnetic field is: