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SP212/3321&5521 Chapter 22 - Worksheet #3 Question 1: A point particle with mass m=2.50×10−4 kg and charge q=−3.50µC has an initial velocity of ~v0 =(200 m/s)î when it enters a region of space with a uniform electric field of ~ E=(2500 N/C)î. What is the particle’s speed 4.00 s after it entered this region? v0 =200 m/s q=−3.50µC E=2500 N/C Question 2: A point particle with mass m=2.50×10−4 kg and charge q=−3.50µC has an initial velocity of ~v0 =(200 m/s)î when it enters a region of space with a uniform electric field of ~ E=(2500 N/C)ĵ. What is the particle’s speed 4.00 s after it entered this region? v0 =200 m/s q=−3.50µC E=2500 N/C SP212/3321&5521 Chapter 22 - Worksheet #3 A dipole consists of two charges, of +2.50 mC and −2.50 mC, separated by a distance of 2.5×10−9 m. This dipole is placed in an electric field of strength E=5500 N/C. The dipole is oriented as shown, with the dipole moment making a 60◦ angle with the field. +1.25 mC + 60◦ E=5500 N/C − −1.25 mC Question 3: What is the magnitude of the instantaneous torque acting on the dipole? Is the torque clockwise or counter-clockwise? Question 4: The dipole is then rotated 180◦ so that the dipole moment now makes a 240◦ (or −60◦ ) angle with the electric field. What was the change in the potential energy of the dipole?