Question

# a toy uses circuit with capacitors to create LEDs flash more quickly. 3 capacitors C1, C2,...

a toy uses circuit with capacitors to create LEDs flash more quickly. 3 capacitors C1, C2, C3 are in series from points a to b. What can be said about equivalent capacitance Cab?

C1= 5 uF C2= 7 uF C3= unknown . SELECT ALL THAT APPLY (MORE THAN ONE)

Answers: 5 uF < Cab < 7uF

Cab > 12 uF

Cab< 5 uF

Cab< C3

5 uF < Cab < 12 uF

A piece of metal is in uniform E field. which are correct (MORE THAN ONE CAN BE TRUE)?

Choices:

surface of the conductor is neutral

all the free electrons go to surface of conductor

electric field just outside the surface of the conductor is perpendicular to surface

electric field is zero inside the conductor

None of the above

You put a charge on metal. Which are true? (SELECT ALL THAT APPLY)

CHOICES:

electric field is constant at surface

electric field is zero at surface

electric potential is constant over the surface

electric potential of surface is zero

electric field is perpendicular to surface

PLS answer all as they similar

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