An air-filled toroidal solenoid has a mean radius of 15.5 cm and a cross-sectional area of 4.95 cm^2. When the current is 12.5 A, the energy stored is 0.395 J. How many turns does the winding have?

281 turns

Explanation:

Energy stored (U) = 0.395 J

After Rearranging, we get

Therefore,

Where,

Now

emily ruth's annual premium is $1058.50

step-by-step explanation:

emily ruth is a female of 27 years age purchasing 20 year endowment insurance with face value $25000.

from the given table,

for females, the age of a male 3 years younger should be used.

so, we have to check for 24 year male for 20 year endowment.

it is 42.34 for every $1000 face value.

for a face value of $25000,

it is 25 * 42.34 = $1058.50

∴ emily ruth's annual premium is $1058.50

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.