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There are a few possibilities. First, if the charge q is at rest in the electric field E and magnetic field B, then only the electric field exerts a force because the charge must be moving for the magnetic field to exert a force. This electrostatic force is qE and its parallel to E if q is positive and antiparallel if q is negative. Second, if the charge is moving with velocity v ,the electric force is same as above. The magnetic force will now be qvBSin(A), Where A is the angle between the directions of B&v. If q is positive the direction of the magnetic force is perpendicular to the plane formed by B & v as found by curling the fingers of your right hand from v toward B. If q is negative its opposite the positive case. Notice; if v is parallel or antiparallel to B then Sin(0) or Sin(180) is zero and the magnetic force is zero. If v is perpendicular to B then Sin(90) =1 and the force is maximum. You always use the smallest angle A between the directions of B & v so it will never be greater then 180 deg. The Net force will then be the vector sum of these two forces. It would be a special case if qE & qvBSin(A) were parallel so you do have to pay attention to the directions when getting the vector sum. In your problem, if the charge is initially at rest then qE will cause it to accelerate parallel to E, which is also parallel to B, so there will never be a magnetic force. If, on the other hand, the charge moves into the fields with some velocity not parallel to the fields then you have to do the full analysis described above.
What else can I help you with?
Why is the magnetic field a vector quantity?
Magnetism is a force. Vector notation is required to indicate magnitude and direction of a force.
Why do two magnetic lines never intersect each other?
It is important to realize that magnetic lines do not really exist! They are a tool to visualize the magnetic field, but the field is continuous and does not exist solely inside lines. The direction of the lines gives the direction of the magnetic field, the density of lines, its strength. This also explains why no two field lines can ever intersect; a field line carries information about the direction of the magnetic field, if they would intersect an ambiguity would arise about the direction (not to mention a field of apparent infinite strength since the density would be infinite at the point of crossing). The field lines are almost never used in explicit calculations; instead one uses a vector, an entity which contains information about the magnitude and direction of a field in every point in space and time. Adding two magnetic fields is then easy; just add the vectors of both fields in every point in space (and time). You can use the resulting vector field to draw field lines again if you want. An easy way to imagine what would happen to field lines when they might intersect is to look at them as being such vectors. Imagine you have one field line pointing to the right, and another one pointing up. The result of adding would be a field line pointing somewhere in the up-right direction (the exact direction depending on the relative magnitudes of the fields). If the fields are equal in magnitude but opposite in direction they would cancel; the field line disappears. But this is to be expected! The magnetic fields canceled each other in that point! One has to take care with this analogy however; as for field lines the measure of magnitude is their density; which is an undefined thing if you are considering just one field line per field. For a vector however, the measure of magnitude is its length. Therefore adding two field lines of the same magnitude and pointing in the same direction would result in a vector of twice the length, but in field line language you would have to double the density at that point. This is one of the reasons field lines are used for visualization but not calculation. By the way, all these things apply to other fields as well. Electric fields can also be represented by field lines, and they as well cannot intersect (for the same reasons). Electric field lines, however, are not necessarily closed loops like magnetic field lines (this has to do with the non-existence of magnetic monopoles).
Is magnetic field strength a vector quantity?
When one refers to the strength of a magnetic field, they're usually referring to the scalar magnitude of the magnetic field vector, so no.
Function of a magnetic compass?
The function of a magnetic compass is to show the direction toward the magnetic poles of the Earth. It is used as a navigation tool.
Is magnetic field a scalar or density quantity?
A magnetic field is neither: it is a vector field with both direction and quantity.
Can electromagnetic wave deflect by electric or magnetic field?
Yes, electromagnetic waves can be deflected by electric or magnetic fields. The direction and magnitude of the deflection depend on the orientation and strength of the field relative to the direction of the wave propagation. This phenomenon is the basis for technologies such as antennas and magnetic resonance imaging (MRI).
What is the difference between a magnetic field and an electric field, and how do their properties and interactions differ?
A magnetic field is created by moving electric charges, while an electric field is created by stationary electric charges. The properties of a magnetic field include direction and strength, while an electric field has direction and magnitude. The interactions between magnetic fields involve attraction or repulsion of magnetic materials, while electric fields interact with charges to create forces.
What is the right hand rule for determining the direction of the electromagnetic wave's electric and magnetic fields?
The right hand rule is a method used to determine the direction of the electric and magnetic fields in an electromagnetic wave. Point your right thumb in the direction of the wave's propagation (movement), your fingers will curl in the direction of the electric field, and your palm will face in the direction of the magnetic field.
What are two things that determine the size of the electric current inducted?
Speed & direction of the magnetic field.
An electric current produces?
Produces magnetic fields, that are used in generators, inductors and motors. The magnetic field at any given point is specified by both a magnitude and a direction.
What are the factors that determine the size and direction of the emf generated by the permanent magnet generator.?
number of conductors speed magnitude of the magnetic flux
An electric current flowing through a wire gives rise to a magnetic field whose direction depends upon what of the current?
The direction of the magnetic field produced by an electric current flowing through a wire is dependent on the direction of the current. The right-hand rule can be used to determine the direction of the magnetic field relative to the direction of the current flow.
What happens to the magnitude of a magnetic field if the electric field that induces it increases the rate at which it changes?
The magnitude of the magnetic field is decreased
Why can an electric current create a magnetic field?
An electric current creates a magnetic field because moving charges generate a magnetic field around them according to the right-hand rule. This magnetic field is perpendicular to both the direction of the current and the surrounding space. The strength of the magnetic field is dependent on the magnitude of the current.
What is the ratio of the magnitude of the electric force to the magnitude of the magnetic force in a given scenario?
The ratio of the magnitude of the electric force to the magnitude of the magnetic force in a given scenario is determined by the charge and velocity of the particles involved. This ratio is known as the electromagnetic force ratio.
What in this world have magnitude but no direction?
Those having only magnitude but no direction are known as scalar quantity. Time, mass, work, power, electric current, electric charge, moment of inertia, magnetic flux, electric flux and so many are found to be scalar in this world.
How can one determine the direction of the magnetic force using the keyword "how to find direction of magnetic force"?
To determine the direction of the magnetic force, you can use the right-hand rule. Point your thumb in the direction of the current, and curl your fingers in the direction of the magnetic field. The direction your fingers point is the direction of the magnetic force.
