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A bakelite capacitor is to be constructed to have a capacitance of 0.04µF and to have a steady workingpotential of 1kVmaximum. Allowing a safe value of field stress of 25MV/m find
(a) the thickness of bakelite needed,
(b) the area of plate needed if the relative permittivity of bakelite is 5,
(c) the maximum energy stored by the capacitor and
(d) the average power developed if this energy is dissipated in a time of 20µs.
Q. What is dielectric polarization? The arrangement of the dipole moments of the permanent or induced dipoles in the direction of applied electric field is called polarisation
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Q. When the negative feedback is practical to an amplifier of gain 50 the gain falls to 25. Compute the feedback ratio? Af = A / 1 + Aβ 25 = 50 / 1 + 50 β 1 = 2 / 1 + 50
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A hiker tosses a rock into a canyon. He hears it strike water 4.78 s later. How far down is the surface of the water?
How to obtain localized fringes
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