What is the best explanation for the observation that the electriccharge on the stem became positive as the charged bee approached (beforeit landed)? Bees that had visited the plant earlier deposited a positive charge on the stem.

A positively charged rod is brought near a metal electroscope that is initially uncharged. As shown in the figure, the rod does not touch the electroscope. There is no charge transfer between the electroscope and rod, but the leaves of the electroscope move apart from each other when the rod is brought near the top of the electroscope. Which one of the following choices is the best explanation for this phenomenon? + + + + + + electroscope O Protons are repelled by the rod into the leaves of the electroscope. Electrons are attracted out of the leaves of the electroscope toward the rod. Protons are repelled into the leaves of the electroscope and electrons are attracted out of the leaves of the electroscope. O Positively charged electrons are repelled by the rod into the leaves of the electroscope. O Positively charged electrons are repelled into the leaves of the electroscope and regular electrons are attracted out of the leaves of the electroscope.

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20. In the human body, nerve cells work by pumping sodium ions out of the cell in order to maintain a potential difference across the cell wall. If a sodium ion carries a charge of 1.60x10^-19 C as it is pumped with an electrical force of 2.0x10^-12 N, What is the electric field between the inside and the outside of the nerve cell?