. A uniform electric field exists in a region between two oppositely charged pla
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Question
. A uniform electric field exists in a region between two oppositely charged plates. An electron is released from rest at the surface of the negatively charged plate and strikes the surface of the opposite plate 8.00 cm. away, in a time of 1.50E-08 s. What is the magnitude of the electric field (in newtons/coulomb)?
A dipole consists of two charges of opposite sign, and each charge has a magnitude of 1.20E-18 C. They are separated by 6.00E-10 m. What is the magnitude of the torque (in newton-meters) on the dipole when it is aligned perpendicularly to an electric field of 1.80 N./C.?
Explanation / Answer
a)
Here ,
d = 0.08 m
t = 1.5 *10^-8 s
as Using second equation of motion ,
d = 0.5at^2
0.08 = 0.5 * a*(1.5 *10^-8)^2
a = 7.11 *10^14 m/s^2
Using second law of motion
e*E = me*a
E = 7.11 *10^14*me/e
E = 4043 N/C
the magnitude of field is 4043 N/C
b)
Torque =q*d*E*sin(theta)
Torque = 1.20*10^-18 * 6*10^-10 * 1.8 *sin(90)
Torque = 1.296 *10^-27 N.m
the Torque acting on the dipole is 1.296 *10^-27 N.m
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