Question 1
The electron gun in a television tube accelerates electrons (mass = 9.11 × 10−31 kg, charge = 1.60 × 10−19 C) from rest to 3.00 × 107 m/s within a distance of 2.00 cm. What electric field is required?
Question 2
A +15-nC point charge is placed on the x axis at x = 1.5 m, and a −20-nC charge is placed on the y axis at y = −2.0m. What is the magnitude of the electric field at the origin?
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105 N/C
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15 N/C
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75 N/C
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45 N/C
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60 N/C