To solve this problem we will apply the concepts related to the Voltage depending on the Electric field and the distance where it is applied. The relationship of this relationship is given in the following form:

Here,
E = Electric Field
V = Voltage
d = Distance
Our values are given as,



Replacing at the first equation we have,


Therefore the electric field in the strip is 2.866V/m
Speed of wave = wavelength * frequency
Therefore, wavelength is 2.0 x 10^-8
Answer:
False.
Explanation:
Removing the radiator cap will harm you. If the engine is hot and you open the radiator cap then it will cause the liquid boil, pushing the coolant out of the radiator and spraying around the liquid which can harm the person who is opening that cap. So you should aware of the risk and be prepared to avoid danger.
Answer:
Required charge
.

Explanation:
Given:
Diameter of the isolated plastic sphere = 25.0 cm
Magnitude of the Electric field = 1500 N/C
now
Electric field (E) is given as:

where,
k = coulomb's constant = 9 × 10⁹ N
q = required charge
r = distance of the point from the charge where electric field is being measured
The value of r at the just outside of the sphere = 
thus, according to the given data

or

or
Required charge
.
Now,
the number of electrons (n) required will be

or

or
