Chapter 26: Q. 1 (page 736)
Figure Q26.1 shows the -component of as a function of . Draw a graph of in this same region of space. Let and include an appropriate vertical scale.
Short Answer
The required graph is
Chapter 26: Q. 1 (page 736)
Figure Q26.1 shows the -component of as a function of . Draw a graph of in this same region of space. Let and include an appropriate vertical scale.
The required graph is
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Get started for freeA typical cell has a layer of negative charge on the inner surface of the cell wall and a layer of positive charge on the outside surface, thus making the cell wall a capacitor. What is the capacitance of a -diameter cell with a -thick cell wall whose dielectric constant is ? Because the cell’s diameter is much larger than the wall thickness, it is reasonable to ignore the curvature of the cell and think of it as a parallel-plate capacitor.
Engineers discover that the electric potential between two electrodes can be modeled as , where is a constant, is the distance from the first electrode in the direction of the second, and is the distance between the electrodes. What is the electric field strength midway between the electrodes?
An ideal parallel-plate capacitor has a uniform electric field between the plates, zero-field outside. By superposition, half the field strength is due to one plate and a half due to the other.
a. The plates of a parallel-plate capacitor are oppositely charged and attract each other. Find an expression in terms of and the plate separation for the force one plate exerts on the other.
b. What is the attractive force on each plate of a capacitor with a plate spacing whencharged to ?
What is the equivalent capacitance of the three capacitors in Figure ?
An isolated parallel-plate capacitor has of charge. An external force changes the distance between the electrodes until the capacitance is . How much work is done by the external force?
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