An electric dipole consists of charges +2 e and -2 e separated by 0.94 nm. It is

Question

An electric dipole consists of charges +2e and -2e separated by 0.94 nm. It is in an electric field of strength 4.9 x 106 N/C. Calculate the magnitude of the torque on the dipole when the dipole moment is (a) parallel to, (b) perpendicular to, and (c) antiparallel to the electric field.

(a)

Number

Units

(b)

Number

Units

(c)

Number

Units

(a)

Number

Units

An electric dipole consists of charges +2e and -2e separated by 0.94 nm. It is in an electric field of strength 4.9 times 106 N/C. Calculate the magnitude of the torque on the dipole when the dipole moment is (a) parallel to, (b) perpendicular to, and (c) antiparallel to the electric field.

Explanation / Answer

a)

T=QdEsin(x)

T=(2*1.6*10^-19)(0.94*10^-9)(4.9*10^6)*sin(0)

T=0 N

b)

T=(2*1.6*10^-19)(0.94*10^-9)(4.9*10^6)*sin(90)

T=1.47*10^-21 N

c)

T=(2*1.6*10^-19)(0.94*10^-9)(4.9*10^6)*sin(180)

T=0 N

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