A coil with a self-inductance of 6.0 H has a constant current of ...

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A coil with a self-inductance of 6.0 H has a constant current of 2.0 A flowing through it for 2.0 s. What is the emf induced in this coil?
 
  A) 6.0 V
  B) 12 V
  C) 0.0 V
  D) 4.0 V
  E) 8.0 V

Question 2

Suppose you were to try to create a proton-antiproton pair by annihilation of two very high-energy gamma rays of the same wavelength heading toward each other. The proton and the anti-proton have the same masses, but opposite charges.
 
  What would be the minimum energy needed for each photon? (e = 1.60  10-19 C, mproton = 1.67  10-27 kg, c = 3.00  108 m/s)
  A) 223 MeV B) 1880 MeV C) 12.2 MeV D) 1.022 MeV E) 939 MeV

[meryzewe]

Answer to Question 1

C

Answer to Question 2

E

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Excellent

[xiazhe]

Thanks for the timely response, appreciate it