36 TREATISE ON ALTERNATING CURRENTS. 



15. What is the fall of potential (1) along the resistance, (2) the self-induction, 

 and (3) the capacity in Question 14 ? 



Answer. (1) 0-268 volt, (2) 6-74 volts, (3) 1066-3 volts. 



16. What value of the capacity will make the circuit in Question 14 non- 

 reactive ? 



Ansiver. 7-9154 microfarads. 



17. What is the difference in phase between E.M.F. and current in 

 Question 14? 



Answer. 89 51'. 



18. Prove that the R.M.S. value of a simple periodic function is the maxi- 

 mum value divided by ^/2, employing the simple trigonometrical method as on 

 page 39. 



