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Question 1
This question is about the electric field around a +1 μC charge. |
a) | Draw arrows on the diagram below to show the electric field around the positive charge.
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b) | State what the direction of the electric field lines represent.
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c) | A +2 nC charge is placed 4 cm away from the +1 μC charge. Calculate the force experienced by the +2 nC charge.
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d) | Add an arrow to the diagram below to show the direction of force on the +2 nC charge.
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Question 2
This question is about the electric field between two point charges. |
a) | State Coulomb's law for the force between two point charges.
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b) | A student is investigating the force between a -2 nC charge and a -4 nC charge. Plot a graph to show how the force experienced varies with separation. Label your axes with suitable values.
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c) | The -4 nC charge is removed. Calculate the electric field strength at a distance of 8 cm from the -2 nC charge.
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d) | A +1 nC test charge is placed 8 cm from the -2 nC charge. Calculate the work done on the positive test charge when it is moved to a distance of 20 cm from the -2 nC charge.
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Question 3
A student is investigating the electric field between two parallel metal plates. |
a) | The metal plates are separated by 15 cm and have a potential difference of 1.2 kV applied across them. Calculate the electric field strength E.
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b) | Draw the electric field between the two metal plates.
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c) | A 1 μC charge is placed in the field as shown below. The charge is held in equilibrium by the electric field. State the polarity of the 1 μC charge.
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d) | The charge is held in equilibrium. Calculate the mass of the 1 μC charge.
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e) | The charge moves along the 300 V equipotential from left to right. State the work done on the charge.
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Question 4
This question is about the electric field around point charges. The diagram below shows the radial field around a +1 μC charge. |
a) | Draw the electric field around a +2 μC charge.
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b) | The +2 μC is placed 1 m from the +1 μC charge. Calculate the electric potential V at point P.
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c) | A +1 nC charge is placed at P. Calculate the work done on the +1 nC charge when it is moved left by 50 cm.
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d) | The +1 nC charge is released when it is 0.5m from the +2 μC charge. Calculate the initial acceleration of the +1 nC charge if it has a mass of 10 mg.
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Question 5
A charged ball is suspended on a nylon thread between to parallel metal plates. A potential difference is applied across the plates as shown. |
a) | Draw the electric field between the two metal plates.
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b) | State the polarity of the charge Q.
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c) | Calculate the electric field strength between the metal plates.
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d) | The mass of the charge Q is 2 g. The angle between the thread and vertical is 27°. Calculate the charge of Q.
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e) | The plates are moved closer together and the potential difference between the plates is increased slowly to 4 kV. Explain the effect that this has on the deflection of the ball and explain why the ball begins oscillating between the two plates.
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Question 6
The diagram below shows two parallel metal plates of length 10 cm. A potential difference is applied across the plates. |
a) | Draw field lines on the diagram below to show the electric field between the two metal plates.
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b) | The plates are separated by 20 cm. Calculate the electric field strength between the plates.
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c) | An electron enters the electric field half way between the plates, travelling at 0.8c, where c is the speed of light in a vacuum. Calculate the acceleration of the electron in the vertical direction due to the electric field.
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d) | Calculate the vertical displacement of the electron while it is in the field.
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Question 7
This question is about electric fields. |
a) | Define electric potential at a point in an electric field.
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b) | Points X, Y and Z are points in the electric field of charge Q. The electric potential at point Y is 9 V. Calculate the charge of Q.
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c) | A +1 nC charge is placed at Z. Calculate the force of repulsion between the two charges.
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d) | The 1 nC charge at Z is brought to point X. Calculate the work done on the 1 nC in moving it from point Z to point X.
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Question 8
A charged particle is held at rest 20 cm above a uniform electric field. The particle has a charge of - 1 x 10-6 C. |
a) | The charged particle is released and it falls through the electric field. Calculate the speed of the charged particle as it enters the electric field.
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b) | Calculate the electric field strength between the two metal plates.
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c) | The charged particle enters the electric field at the midpoint between the two plates. Draw the path of the charged particle on the diagram.
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d) | The mass of the charged particle is 0.6 grams. Calculate the vertical distance travelled by the charged particle from when it is released to when it touches the metal plate.
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Question 9
Two particles are held at rest in a uniform electric field. The electric field strength is 2,500 V m-1. Particle X is uncharged. Particle Y has a charge of +1 μC. |
a) | State the feature of the diagram above that shows the electric field is uniform.
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b) | Both particles are released from rest and they fall through the electric field. State the acceleration of particle X.
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c) | Calculate the acceleration of particle Y.
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d) | Both particles fall a distance of 10 m before hitting the ground. Calculate how the time taken between the two particles hitting the ground.
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| 1 | 2 | 3 | 4 | 5 | 6 |
| 7 | 8 | 9 |