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    Question

    A dipole with moment p = 2i + 3j - 4k is placed at A(2,

    тИТ3, 1). Find the electric potential at point B(4, тИТ1, 0) in volts. (Use 1/(4 ╧А ╬╡0) = 9 ├Ч 109 Nm2/C2
    A 10.89 ├Ч 109V Correct Answer Incorrect Answer
    B 13.54 ├Ч 109V Correct Answer Incorrect Answer
    C 5.31 ├Ч 109V Correct Answer Incorrect Answer
    D 4.67 ├Ч 109V Correct Answer Incorrect Answer

    Solution

    The electric potential V at a point due to an electric dipole with dipole moment p is given by: where r is the vector from the location of the dipole to the point at which the potential is being calculated, and r= тИг r тИг is the magnitude of this vector. Given the position of the dipole at A(2, тИТ3, 1) and the point B(4, тИТ1, 0) where the potential is to be found, the vector r is given by: r = rB тАУ rA = (4-2)i + (-1-(-3))j+(0-1)k = 2i+2j-k The magnitude of r is: The dipole moment is given as p=2i+3jтИТ4k. Now, we calculate the dot product p тЛЕ r: p тЛЕ r=(2)(2)+(3)(2)+(тИТ4)(тИТ1)=4+6+4=14 The electric potential at point B is:

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