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## Homework Statement

The HCl (hydrochloric acid) molecule has a dipole moment of about 3.4x10-30 C.m. The two atoms are separated by about 1.10-10 m. What is the net charge on each atom? What is maximal torque that this dipole will experience in a 5.104 N/C electric field? How much energy one would need to rotate one molecule 45o from its equilibrium orientation?

## Homework Equations

A) Can't figure out which formula to use to find the net charge

B) τ = P X E

C)

**Not sure about this one:**W = ΔU = U

_{45°}- U

_{0°}= - PE Cos45° - (- PE Cos 0°)

**NOTE: For B, I am assuming that the initial angle is 0° to make my life easier since the information is not provided**

## The Attempt at a Solution

A) Can't figure out which formula to use to find the net charge

B) 3.4 X 10

^{-30}Cm χ 5 X 10

^{4}N/C = 2.3 X 10

^{-27}Nm, or Joules

C) (-2.3 X 10

^{-27}J X cos 45°) + 2.3 X 10

^{-27}J

= -1.626 X 10

^{-27}J + 2.3 X 10

^{-27}J =

**6.74 X 10**

^{-28}JDoes that make sense for B and C? And could you give me any pointers for A?

Thank you!

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