3. PHET E&M simulations e D Question 1 10 pts Electrical capacitance can be thin
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3. PHET E&M simulations e D Question 1 10 pts Electrical capacitance can be think of as the capacity to withstand charge. It is obvious that for spherical objects this is dependent on the radius; the larger the radius (the size) the higher the capacity to hold extra charge. On the other hand, the field due to a charged sphere is also dependent on the size. In this regard we need to understand the concept of curvature e linked here. Read the section "Curvature of plane curves" to find the answer to this question. Select all true statement of curvature: 0 curvature of a straight line is zero 0 curvature of a circle- 1/ radius a the smaller the radius the higher the curvature a tip of a needle has a higher curvature than the surface of a base ball 10 pts DQuestion 2 Please read the section 25-1 Capacitance to find the answer to this question.Explanation / Answer
1. the curvature of a straight line to be constantly zero.
The curvature of a circle of radius R should be large if R is small and small if R is large. Thus the curvature of a circle is defined to be the reciprocal of the radius: k = 1/R.
A circle with infinite radius is a line.
smaller the curvature, larger the radius and vice-versa
2. last option is incorrect,rest all are correct.
9. Capacitance is the ratio of charge to voltage. Introducing a dielectric into a capacitor decreases the electric field, which decreases the voltage, which increases the capacitance.
except the 4th one,rest all are true since c=4pi.e/(1/a-1/b) for spherical capacitor.
8. except the 3rd one,all are correct.
incase of doubt,please comment
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