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A) Two charges +4esu and +9 esu are situated at a distance of 10 cm . A unit charge is situated at a point on the line joining the charges.  At what point the unit charge experiences a force which is  (a) equal and opposite,(b)equal and in the same direction? B) Two conductors have resistance R1 and R2 at 0°C. Their temperature coefficients of resistances are a1 and a2 respectively.  Show that the temperature coefficients of their equivalent resistances when joined in series and in parallel are respectively   (R1a1+R2a2)/(R1+R2) and (R1a2+R2a1)/(R1+R2)
Asked by mridulabarua05 | 07 Feb, 2019, 09:21: AM
As per our policy only one question is going to be answered in one url.
Solution is attached.
Answered by Ankit K | 07 Feb, 2019, 10:45: AM

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