Please Help! (1 Viewer)

[angmor]

ive got an assessment to do this friday ... and i need your help.

im goin to be given an unknown set of data , and from this determine FORCE ON A CHARGED OBJECT IN AN ELECTRIC FIELD. what sort of equations and data do u think i will need to know?
thanks in advance for the help

 

[passion89]

Make sure you know:
F = qvBsin(theta)
E = V/d
F = qE

 

[angmor]

thx for that but what does it mean force on a charged object? can somebody help me clarify this abit?

 

[passion89]

It refers to the force on an object that is either charged positively or negatively.

To clarify it a bit more for you, the force acting on a positive charge is outward ie: the force lines are moving away from the positive charge in all directions.

The force acting on a negative charge is inward ie: the force lines are moving toward the negative charge from all directions.

Those are the directions of force on charged objects. The magnitude is given by the formulae above.

 

[angmor]

so, we will be told whether the charge is positive or negative right? or is there a way to work out whether a charge is positive or negative other than the direction its force lines are moving?
thanks

also btw, is E=v/d applicable only to UNIFORM electric fields?

 

[passion89]

They might tell you...Depends on what kind of question it is.

But if they don't, you can work it out by using the right-hand palm rule. That is: the thumb represents the direction of conventional current, the fingers represent the direction of the magnetic force and the palm represents the direction of the force.

If it is a negative charge, the direction of the current, represented by the thumb, changes direction (because electron flow is from negative to positive whereas conventional current is from positive to negative).