A small, m = 3.50 g plasticball is suspended by a 20.0 cm long string in a unifo

Question

A small, m = 3.50 g plasticball is suspended by a 20.0 cm long string in a uniform electricfield as shown in Figure P19.54. If the ball is in equilibrium whenthe string makes a 15.0° angle with the vertical, what is thenet charge on the ball?

_____________ µC A small, m = 3.50 g plasticball is suspended by a 20.0 cm long string in a uniform electricfield as shown in Figure P19.54. If the ball is in equilibrium whenthe string makes a 15.0° angle with the vertical, what is thenet charge on the ball?

_____________ µC

Explanation / Answer

A small, m = 3.50 g plasticball is suspended by a 20.0 cm long string in a uniform electricfield as shown in Figure P19.54. If the ball is in equilibrium whenthe string makes a 15.0° angle with the vertical, what is thenet charge on the ball?
tan15=Eq/mg
where E is the electric field
q is the charge
m is the mass in kg
and g is the acceleration due to gravity.
from the above expression
q =3.5*10-3*9.8*tan15/E


_____________ µC

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