6. The figure shows the NH, molecule with 3 hydrogen atoms forming an equilateral triangle and the nitrogen above the plane. The three electrons from the hydrogen atoms are shared with the nitrogen making the hydrogen atoms positive and the nitrogen negative giving the nitrogen an effective charge -e and each hydrogen atom an effective charge +1/3e. What is the electric field at the center of the triangle formed by the 3 hydrogen atoms (point P)? A. 2.9x10" V/m upward B. 2.9x10" V/m downward C. 0 V/m D. 1.4x10" V/m upward 1.0 A E. 1.4x10" V/m downward 0.7 Ai H 0.7A P 1.6 A 8. When an axon is polarized and ready to fire, the resting potential is V=-80mV. What is the potential energy of a Cl- ion located inside the axon if zero potential energy is defined as U=0 outside the axon A. -128 meV B. -80 meV C. 0 meV D. +80 meV E. +128 meV