Three positive charges are arranged as shown in the diagram.
2 answers:
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Answer:
The value is
Explanation:
From the question we are told that
The dielectric constant is k = 1.5
The area of each plate is
The distance between the plates is
The charge on the capacitor is
Generally the electric field in a vacuum is mathematically represented as
Generally is the voltage of the capacitor which is mathematically represented as
Here is the capacitance of the capacitor in a vacuum which is mathematically represented as
Here is a constant with value
=>
=>
So
So
=>
The electric field when the dielectric slab is inserted is mathematically represented as
=>
=>
Generally the electric field between the plates is mathematically evaluated as
=>
=>
Generally the potential difference between the plates is
=>
Answer:
635 years old
Explanation:
The light reaching the earth from the sun will travel at a speed called the speed of light, and this has a universal value of 3 × 10⁸ m/s. Bearing this in mind, let us calculate the age of the light reaching the Earth from the sun:
Distance of star from Earth = 6.1 × 10⁸m
Speed of light = 3 × 10⁸ m/s
We have distance and speed, let us calculate the time of travel of the light from the star to the earth.
Distance = speed × time
6.1 × 10⁸ = 3 × 10⁸ × time
In order to do the division above, we will divide the whole numbers normally, then we will apply the law of indices to the power that says:
Xᵃ ÷ Xᵇ = X⁽ᵃ⁻ᵇ⁾
Next, we are told that there are 3.2 × 10⁷ seconds in a year.
∴ The number of years travelled by the light from the star:
please note that:
2.03 × 10¹⁰ = 20300000000
3.2 × 10⁷ = 32000000
The closest answer in the option is 635 years, and we are short of this by some points due probably to approximations in the calculation.