7. A musician is staying near the motorway and is playing a constant 300 Hz tone on his flute. You are driving along the motorway at 100 km/h. What is the frequency you hear from the flautist’s instrument before you pass them, and after you pass them?

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electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j