Electric field intensity

A solid plastic sphere with a radius of 10 cm bears a uniform surface charge density of 360 µC/m2. What is the electric field intensity 1 cm into the sphere from the surface? Assume the permittivity is 9 pC2/N·m2.

Group of answer choices03.6 MN/C

4 MN/C

0.4 MN/C

Question 2

An electron moving out of the page encounters a uniform magnetic field directed right. Which way is the initial magnetic force on the electron directed?

Group of answer choicesRIGHTLEFT

DOWN THE PAGE

UP THE PAGE

Question 3

A bar magnet is dropped north-end-down through a horizontal copper ring. Just after the magnet passes through the ring, which way is the induced current in the ring rotating as viewed from above.

Sample Solution
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