Lesson 6.2.4
6.2.4 Electric potential and energy Quiz: OCR Physics, Unit 5
20 questions
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Lesson 6.2.4, Electric potential and energy: 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 is the value of electric potential at an infinite distance from a point charge?
- One volt
- Maximum
- Infinity
- Zero
-
What quantity is represented by the area under a force-distance graph for point charges?
- Work done
- Electric charge
- Electric potential
- Force constant
-
What is the SI unit for magnetic flux density?
- Tesla
- Henry
- Weber
- Farad
-
Which rule determines the direction of force on a current-carrying wire in a magnetic field?
- Fleming's left-hand rule
- Fleming's right-hand rule
- Right-hand grip rule
- Ampere's rule
-
Electric potential is defined as work done per unit of which quantity?
- Current
- Negative charge
- Mass
- Positive charge
-
Magnetic fields are produced by permanent magnets or by which of the following?
- Stationary charges
- High voltage
- Moving charges
- Neutral particles
-
What is the shape of the magnetic field lines around a long straight current-carrying wire?
- Helical loops
- Radial lines
- Parallel lines
- Concentric circles
-
What formula gives the capacitance of an isolated spherical conductor of radius R?
- C = 4πε₀ / R
- C = Q / R
- C = 4πε₀R²
- C = 4πε₀R
-
How does electric potential vary with distance r from a point charge?
- Independent of r
- Proportional to 1/r²
- Proportional to 1/r
- Proportional to r
-
What happens to the electric potential energy between two positive charges as distance increases?
- It stays constant
- It increases
- It becomes negative
- It decreases
-
A wire of length L carries current I perpendicular to field B. What is the magnetic force?
- F = BIL
- F = BI / L
- F = IL / B
- F = B / (IL)
-
What angle between a current-carrying wire and a magnetic field produces maximum force?
- 0 degrees
- 45 degrees
- 90 degrees
- 180 degrees
-
A charge Q moves at velocity v perpendicular to field B. What is the magnetic force?
- F = Qv / B
- F = BQv
- F = BQ / v
- F = Bv / Q
-
If distance from a point charge doubles, what happens to the electric potential?
- Quadruples
- Quarters
- Doubles
- Halves
-
In Fleming's left-hand rule, what does the second finger represent?
- Magnetic field
- Current
- Force
- Motion
-
In a digital balance experiment measuring B, what force does the wire exert on magnets?
- Parallel force
- Zero force
- Double the weight
- Equal and opposite
-
How does electric field strength vary with distance r, compared to potential V?
- Both ∝ 1/r
- Both ∝ 1/r²
- V ∝ 1/r², E ∝ 1/r
- V ∝ 1/r, E ∝ 1/r²
-
What is the electric potential energy of a charge q at potential V?
- E = V / q
- E = Vq
- E = q / V
- E = ½Vq²
-
If the radius of an isolated metal sphere is doubled, what happens to its capacitance?
- Doubles
- Stays the same
- Halves
- Quadruples
-
What is the magnetic force on a charged particle moving parallel to a magnetic field?
- Maximum
- BQv sin 90
- BQv
- Zero
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