# ALEVEL PHYSICS IAL - ELECTRIC FIELD QS ..HELP plss!Watch

#1
https://pmt.physicsandmathstutor.com...%20A-level.pdf
16 (a)
this is the marking scheme

Electric field shows the direction of the force on a positive charge
A positive charge at P is repelled from the top plate and attracted to the bottom
plate
Or a positive charge at P will experience a downwards force component due to
each of the charges
The components parallel to the plate to the left are all balanced by components parallel to the sheet to the right
The field at P is perpendicular to plates from + to −

i do not understand this point

The components parallel to the plate to the left are all balanced by components parallel to the sheet to the right
0
6 months ago
#2
(Original post by MARYAM1234567)
https://pmt.physicsandmathstutor.com...%20A-level.pdf
16 (a)
this is the marking scheme

Electric field shows the direction of the force on a positive charge
A positive charge at P is repelled from the top plate and attracted to the bottom
plate
Or a positive charge at P will experience a downwards force component due to
each of the charges
The components parallel to the plate to the left are all balanced by components parallel to the sheet to the right
The field at P is perpendicular to plates from + to −

i do not understand this point

The components parallel to the plate to the left are all balanced by components parallel to the sheet to the right
They explained the direction of the field by considering direction of force on a positive charge.

The positive charge is repelled by top plate and attracted to bottom plate. There is a resultant downwards force perpendicular to the plates. So the direction of the field is from positive to negative.

The components parallel to the plate means the horizontal forces. The forces on a positive charge at P to the right are equal to the forces to the left. So the horizontal components balance

Hence the force is downwards. The field is downwards, perpendicular to plates, from + to -
0
#3
(Original post by BobbJo)
They explained the direction of the field by considering direction of force on a positive charge.

The positive charge is repelled by top plate and attracted to bottom plate. There is a resultant downwards force perpendicular to the plates. So the direction of the field is from positive to negative.

The components parallel to the plate means the horizontal forces. The forces on a positive charge at P to the right are equal to the forces to the left. So the horizontal components balance

Hence the force is downwards. The field is downwards, perpendicular to plates, from + to -
Do horizontal forces exist between plates..i thought it was just the electric force
0
6 months ago
#4
(Original post by MARYAM1234567)
Do horizontal forces exist between plates..i thought it was just the electric force

The horizontal force is also electric force

Consider a positive charge placed at P

I considered effect of some charges on P

The red charge directly above P will cause a repulsive downward force. The green charge at P will cause an attractive downward force. They act at the same point P and give a resultant downward force (I showed the arrows separately but they are at the same point)

The other charges cause forces as shown. The components parallel to the plates are balanced.
0
#5
(Original post by MARYAM1234567)
Do horizontal forces exist between plates..i thought it was just the electric force
?..
0
#6
(Original post by BobbJo)
The horizontal force is also electric force

Consider a positive charge placed at P

I considered effect of some charges on P

The red charge directly above P will cause a repulsive downward force. The green charge at P will cause an attractive downward force. They act at the same point P and give a resultant downward force (I showed the arrows separately but they are at the same point)

The other charges cause forces as shown. The components parallel to the plates are balanced.
got it
thanks
0
6 months ago
#7
Use the physics subject forum, this is like the 4th time I've moved your thread
0
#8
(Original post by Sinnoh)
Use the physics subject forum, this is like the 4th time I've moved your thread
but why...
if people are answering me here ..then what's the matter
its easier for me to look up at later as well
but fine
0
6 months ago
#9
(Original post by MARYAM1234567)
but why...
if people are answering me here ..then what's the matter
its easier for me to look up at later as well
but fine
Firstly it'll reach more people who can help out if it's in the right subject forum, it'll show up on feeds. Secondly it's just messier when you've got a weird mix of posts in one forum when there are already forums dedicated to this sort of thing
0
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