EduNinjaA charged rod X is placed on a balance and another rod Y is brought close to it, as shown.
Which combination of charges would cause the change in the balance reading shown?
X
Y
negative charge
negative charge
negative charge
positive charge
negative charge
no charge
positive charge
no charge
Fig. 5.1 shows a sphere that is negatively charged. The sphere is attached to a plastic stand.
Fig. 5.1
On Fig. 5.1, draw arrows to indicate the pattern and direction of the electric field in the region surrounding the sphere.
A smaller, uncharged metal sphere S is suspended by a plastic thread and brought close to the negatively charged sphere. Fig. 5.2 shows the two spheres.
Fig. 5.2
By drawing on Fig. 5.2, indicate the distribution of charge on S .
State what happens to S .
An earth wire is then touched against S .
Describe what happens in the wire and state how this affects the charge on S .
The metal sphere S is an electrical conductor. The plastic thread is an electrical insulator.
Explain this difference by referring to the structures of the two materials.
[Total: 9]
A plastic rod and a dry cloth are uncharged.
The rod is now rubbed with the cloth and they both become charged. The rod becomes negatively charged because some charged particles move from the cloth to the rod.
What is the charge on the cloth and which particles moved in the charging process?
charge
on cloth
particles
that moved
negative
electrons
negative
neutrons
positive
electrons
positive
neutrons
A plastic rod is rubbed with a dry cloth. The rod becomes positively charged.
Why has the rod become positively charged?
It has gained electrons.
It has gained neutrons.
It has lost electrons.
It has lost neutrons.
A plastic rod is rubbed with a cloth.
The rod and the cloth both become charged as electrons move between them.
The rod becomes negatively charged.
Which diagram shows how the rod becomes negatively charged and shows the final charge on the cloth?
An uncharged, metal sphere is placed on an insulating support. A positively charged rod is brought close to the sphere, but does not touch it.
How do the charges in the sphere move and what is now the charge on the sphere?
movement of charges
charge on sphere
negative charges move
to the right of the sphere
positive
negative charges move
to the right of the sphere
neutral
positive charges move
to the left of the sphere
positive
positive charges move
to the left of the sphere
neutral
Which statement describes the direction of an electric field at a point?
the direction of the force on a negative charge
the direction of the force on an N pole
the direction of the force on a positive charge
the direction of the force on an S pole
Which diagram shows the electric field pattern and direction around a positive point charge?
Which diagram shows the electric field pattern between two oppositely charged parallel metal plates?
A stationary, charged particle is in a field.
Which fields can cause there to be a force on this particle due to its charge?
1 gravitational field
2 magnetic field
3 electric field
1 and 2
1 only
2 and 3
3 only