A bug zapper consists of two metal plates connected to a high-voltage power supply. The voltage between the plates is set to give an electric field slightly less than 1×10⁶ V/m . When a bug flies between the two plates, it increases the field enough to initiate a spark that incinerates the bug.
If a bug zapper has a 7000 V power supply, what is the approximate separation between the plates?
(a) 7×10⁻² cm
(b) 0.7 cm
(c) 7 cm
(d) 70 cm

(b) 0.7 cm

Explanation:

E = Electric field =

V = Voltage = 7000 V

d = Seperation between the plates

Electric field is given by

The approximate separation between the plates is 0.7 cm

massxgravity x heght=weightxheight= pe

4900=490xh

h=10

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles