<span>During a medical evaluation, the doctor can D. all of the above. It is the doctor's duty to do all of these things - to establish some guidelines for activities, to see whether these programs are appropriate for the person in question, and to help them pick activities that will be safe for them and which they will be able to do without harming their bodies. These are all the things that doctors do in order to help their patients lead a safe and healthy life.</span>
PE = 0.5 × k × x²
PE potential Energy
k spring constant
x stretch/compression of the spring
The electric field between plates is 4000V/m.
An electric field (sometimes E-field) is the physical field that surrounds electrically charged particles and exerts force on all other charged particles in the field, either attracting or repelling them. It also refers to the physical field for a system of charged particles.
The value of the electric field has dimensions of force per unit charge. In the metre-kilogram-second and SI systems, the appropriate units are newtons per coulomb, equivalent to volts per metre.
The voltage between points A and B is
V=E.d
E =V/d (uniform E- field only)
where d is the distance from A to B, or the distance between the plates.
Given:
distance d = 3 cm
voltage V = 120 V
Electric field E = V/d
E = 120 V / 3cm
E = 40 V / 1 cm [ 1 cm = 1/100 m ]
E = 4000 V/m.
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