Lesson 6.2.1
6.2.1 Point and spherical charges Quiz: OCR Physics, Unit 5
20 questions
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Lesson 6.2.1, Point and spherical charges: 20 multiple choice questions for the OCR Physics (H156), Unit 5: Particles and medical physics, written with Revision Ninja.
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The 20 questions
-
What type of field is created in the space surrounding any electric charge?
- Nuclear field
- Gravitational field
- Electric field
- Magnetic field
-
How can a uniformly charged solid sphere be modelled at points outside its surface?
- Dipole
- Point charge
- Neutral sphere
- Uniform line
-
In what direction do electric field lines always point for a positive charge?
- Concentric circles
- Radially inwards
- Radially outwards
- Parallel to surface
-
Which unit is equivalent to newtons per coulomb for electric field strength?
- Farads per metre
- Joules per coulomb
- Amperes per metre
- Volts per metre
-
At what position is the electric potential due to a point charge defined as zero?
- At centre
- At infinity
- At one metre
- At surface
-
What electrostatic force is experienced between two point charges carrying identical sign charges?
- Attractive force
- Rotational force
- Repulsive force
- Zero force
-
Which equation defines electric field strength in terms of force and charge?
- E = F / q^2
- E = q / F
- E = F / q
- E = F q
-
What property of free space is represented by the physical constant symbolised as ε0?
- Permeability
- Conductivity
- Resistivity
- Permittivity
-
What happens to electrostatic force between charges when distance between them is doubled?
- Decreases by four
- Doubles
- Halves
- Decreases by eight
-
What magnitude of force acts on a 3 C charge in a 12 N C^-1 field?
- 4 N
- 0.25 N
- 15 N
- 36 N
-
How does electric field strength E depend on distance r from a point charge?
- Proportional to 1/r^2
- Proportional to r
- Proportional to 1/r
- Proportional to r^2
-
How does electric potential V vary with distance r from a point charge?
- Proportional to r^2
- Proportional to 1/r
- Proportional to r
- Proportional to 1/r^2
-
What is the formula for the capacitance C of an isolated conducting sphere of radius R?
- C = 4π ε0 R
- C = 4π R / ε0
- C = 4π ε0 / R
- C = ε0 R / 4π
-
How much work is done when moving a charge along an equipotential surface?
- Infinite work
- Maximum work
- One joule
- Zero joules
-
How does electric field strength vary between two oppositely charged parallel plates?
- Increases near negative
- Decreases in centre
- Increases near positive
- Remains constant
-
Which expression calculates uniform electric field strength E between parallel plates separated by distance d?
- E = V / d
- E = V d
- E = d / V
- E = V d^2
-
Which feature distinguishes electric fields from gravitational fields?
- Electric fields attract
- Electric fields repel
- Gravitational fields repel
- Gravitational fields infinite
-
What change occurs to electric potential if distance r from a positive point charge halves?
- It quadruples
- It quarters
- It doubles
- It halves
-
What path does an electron follow when entering a uniform electric field at right angles?
- Parabolic trajectory
- Helical trajectory
- Circular trajectory
- Straight trajectory
-
What is the SI unit for electric potential?
- Volt
- Farad
- Coulomb
- Newton
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