Capacitance, e/g field,

Question 1

Capacitance

Answer 1

Charge per unit potential

Question 2

Time constant (tau)

Answer 2

Time taken for the charge to fall to 37% of original charge

Tau=RC

Question 3

Electric field strength

Answer 3

F per unit charge on a test charge at a point in the field

Question 4

Electric potential

Answer 4

WD per unit charge on a test charge brought form infinity to that pt in the field

Question 5

Is C determined by Q or V

Answer 5

No

Question 6

For both e/gravitational field, What is the grad of V-r graph (dv/dx

Answer 6

Field strength

Question 7

What’s the effect of Dielectric on permittivity and therefore capacitance ?

Answer 7

Makes it bigger

Question 8

Unit of C

Answer 8

F

Question 9

Angle bet équipotential and electric field lines

Answer 9

Rt angle

Question 10

What does closer équipotentials indicate?

Answer 10

Stronger field

Question 11

Escape speed

Answer 11

Min speed needed for a body to escape to infinity from a pt on the surface of a star

Question 12

Assumption made to use the eqn to calculate V/E/g

Answer 12

Pt mass: same as if mass is concentrated in the center

Question 13

why is G potential -?

Answer 13

• work done bringing mass from infinity

Question 14

How big is GPE

Answer 14

10^7