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Electric Circuits
What is the difference between ohmic conductor and non-ohmic conductor? Give
one example each and draw their IV characteristic curves.
one example each and draw their IV characteristic curves.
Electric Circuits
What is the magnitude of the force a +16 charge exerts on a +3.3 mC charge 45 cm away?
Electric Circuits
The potential difference across the terminals of a battery is 8.5V when there is a current of 3A in the circuit form the negative to the positive terminal. When the current is 2A in the reverse direction, the potential difference becomes 11V.
(i) What is the internal resistance of the battery?
(ii) What is the e.m.f of the battery?
(i) What is the internal resistance of the battery?
(ii) What is the e.m.f of the battery?
Electric Circuits
What is the potential difference between two points in a circuit if 200J of electrical energy are changed to other forms of energy when 25 coulombs of electric charge pass? If the charge flows in 10 seconds, what is the current?
Electric Circuits
Compare the electrostatic and gravity force between a proton of charge +e and of mass M at a distance r from an electron of charge -e of mass m, take the proton to be 1840 times heavier than the electron. Evaluate their relative magnitude i.e the ratio of the electrostatic force of attraction to the gravitational force of attraction.
Electric Circuits
water has a dielectric constant.why it is not used as dielectric material in capacitor?
Electric Circuits
A parallel plate capacitor is made of two rectangular aluminium sheets of lateral
dimensions 500 mm and 20 mm. The space between the plates is filled with polystyrene and the separation between plates is 0.15 mm. Calculate the capacitance
of the capacitor and the value of the maximum potential difference that can be
applied across the capacitor without dielectric breakdown. Take the dielectric
constant of polystyrene as 2.6 and the value of the maximum electric field that
polystyrene can withstand as 25×106 Vm−1 .
.
dimensions 500 mm and 20 mm. The space between the plates is filled with polystyrene and the separation between plates is 0.15 mm. Calculate the capacitance
of the capacitor and the value of the maximum potential difference that can be
applied across the capacitor without dielectric breakdown. Take the dielectric
constant of polystyrene as 2.6 and the value of the maximum electric field that
polystyrene can withstand as 25×106 Vm−1 .
.
Electric Circuits
The radius of the wire in a coaxial cable is 0.65 mm and the inner radius of the
coaxial conducting cylinder is 1.45 mm. Assuming that there is vacuum between the
wire and the cylinder, calculate the capacitance of a 1.5 m length of the cable.
coaxial conducting cylinder is 1.45 mm. Assuming that there is vacuum between the
wire and the cylinder, calculate the capacitance of a 1.5 m length of the cable.
Electric Circuits
If the space between the plates of a capacitor is filled will a dielectric material, does
it affect the value of capacitance? Justify your answer.
it affect the value of capacitance? Justify your answer.
Electric Circuits
State and explain the boundary condition for the displacement vector D at the
boundary separating two dielectric media.
boundary separating two dielectric media.
