A negatively charged particle is at rest in a region where a uniform magnetic field points in the positive x direction and a uniform electric field points in the positive y direction
What is the initial direction of the vector sum of the forces exerted on the particle?
A.The vector sum of the forces is initially in the negative x direction.
B.The vector sum of the forces is initially in the negative y direction.
C.The vector sum of the forces is initially in the positive x direction.
D.The vector sum of the forces is initially in the positive y direction.
E.The vector sum of the forces is initially in the negative z direction.
F.The vector sum of the forces is initially in the positive z direction.

For the negatively charged particle, the vector sum of the forces is initially in the negative y direction. Option B is the correct option.

What is magnetic field?

The magnetic field is the field in the space and around the magnet in which the magnetic field can be fill.

Here, in the given problem, the negatively charged particle is at rest in a region where a uniform magnetic field points in the positive x direction.

Thus the particle is at the rest, position then the sum of the forces exerted on the particle is,

[tex]\sum F=0[/tex]

Now, the uniform electric field points in the positive y direction. Thus the deflection should occur only in the y- direction.

As the electric field point in the positive y-direction, thus the forces excreted is in the negative y-direction.

Thus for the negatively charged particle, the vector sum of the forces is initially in the negative y direction. Option B is the correct option.

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