1) Two charges of magnitude 5nC & -2nC are placed at points ( 2cm , 0 , 0 ) & ( 20cm , 0 , 0 ) in a region of space, where there is no external field.. Find electrostatic potential energy of the system.
2) An emf of 96 mV is induced in the windings of a coil when the current in the nearby coil is increased at the rate of 1.20 A/s. What is the mutual inductance of the two coils?
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Answered by
65
1. Two charges of magnitude 5nC and - 2nC are placed at 2cm and 20cm from the origin respectively.
We know that,
Substituting the values,
2. Given Information,
EMF = 96mV
Rate of change of current w.r.t t = 1.20 A/s
Since,
Substituting the values,
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Answered by
56
1. Let p be the point of zero potential be p at distance r from the charge 1..
d=16 cm
Electric potential V = q1 / 4πo r+q2 /4πϵ o (d−r)
for V = 0,
q1 / r = −q2 / d−r
⇒ 5×10¯8 / r = −3×10 −8 / 0.16 - r
r = 10 cm
If , point p is outside ,
v = q1 / 4πϵo r+q2 / 4πϵo (r−d)
so here, r=40 cm
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