+0.5 nC + Figure 2.1 (a) Calculate the electric field the charge is experiencing (b) The +0.5 nC charge is now replaced by a +200 pC charge. Calculate the force on the new charge and state any assumptions you have made.

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Q2
A charge of +0.5 nC is placed near a distribution of other charges as
shown in Figure 2.1 and experiences a force F of 2 x 10-6 N.
+0.5 nC
+
Figure 2.1
(a)
Calculate the electric field the charge is experiencing
(b)
The +0.5 nC charge is now replaced by a +200 pC charge.
Calculate the force on the new charge and state any assumptions
you have made.
(ii)
Sketch a diagram showing the electric field lines in a parallel plate
capacitor. Your diagram should clearly show the positive and negatively
charged plates, the direction of the electric field, and the fringing field.
(ii)
An air-filled parallel plate capacitor has a capacitance of 1 nF.
The separation between the plates is 0.25 mm. Calculate,
(а)
the area of one of the
lates of the capacitor in m?
The space between the plates is subsequently filled with an insulator
having a dielectric strength of 1.5 MV m- and a relative permittivity of 5.
Calculate,
(b)
the capacitance with the insulator inserted
(c)
the maximum voltage that may be applied across the capacitor
(d)
the maximum energy that can be stored in the capacitor
Note: ɛ, = 8.85 × 10-12 Fm-1
Transcribed Image Text:Q2 A charge of +0.5 nC is placed near a distribution of other charges as shown in Figure 2.1 and experiences a force F of 2 x 10-6 N. +0.5 nC + Figure 2.1 (a) Calculate the electric field the charge is experiencing (b) The +0.5 nC charge is now replaced by a +200 pC charge. Calculate the force on the new charge and state any assumptions you have made. (ii) Sketch a diagram showing the electric field lines in a parallel plate capacitor. Your diagram should clearly show the positive and negatively charged plates, the direction of the electric field, and the fringing field. (ii) An air-filled parallel plate capacitor has a capacitance of 1 nF. The separation between the plates is 0.25 mm. Calculate, (а) the area of one of the lates of the capacitor in m? The space between the plates is subsequently filled with an insulator having a dielectric strength of 1.5 MV m- and a relative permittivity of 5. Calculate, (b) the capacitance with the insulator inserted (c) the maximum voltage that may be applied across the capacitor (d) the maximum energy that can be stored in the capacitor Note: ɛ, = 8.85 × 10-12 Fm-1
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