The emf of a particular flashlight battery is 1.5 volts. If the battery is 5.0 cm long, and the radius of the cylindrical battery is 1 cm, estimate roughly the amount of charge on the positive end plate of the battery.

Respuesta :

Answer:

The amount of charge is  [tex]q= 8.342 *10^{-14}C[/tex]

Explanation:

 Here let estimate that the battery is a parallel whose plates are of area = [tex]\pi r^2[/tex] substituting value  

                 [tex]= 3.142*\frac{1}{100} = 3.142 *10^{-4}m^2[/tex]

And the this plates are separated by a length d= 5.0cm

Now looking at this estimate we can see that the setup looks like a capacitor

    So to calculate the capacitance of our estimated capacitor we have

                     [tex]C = \frac{\epsilon A}{d}[/tex]

Where [tex]\epsilon[/tex] is the permitivity of free space with value [tex]= 8.85*10^{-12}\ C^2/Nm^2[/tex]

substituting values

                    [tex]C = \frac{8.85*10^{-12} * 3.142 *10^{-4}}{0.050}[/tex]  

                        [tex]=5.56 *10^{-14} F[/tex]

The charge is mathematically represented as

                [tex]q = CV[/tex]

Substituting values

                 [tex]q =5.56*10^{-14} *1.5[/tex]

                   [tex]= 8.342 *10^{-14}C[/tex]