Answer:A)0.5 and 2 mm
Explanation:
Given
radius R of wire is 1 mm
magnetic Field at edge(surface)
Magnetic Field at a distance r' from Center is
and we know
where
Permeability of free space
distance from center
For
---1
For
---2
Divide 1 and 2
If r is inside the wire then
for
---3
for
----4
Divide 3 and 4
Answer:
22.3 N
Explanation:
The centripetal force acting on a the rock is given by:
where
m = 3.0 kg is the mass of the rock
v is the speed of the rock
r = 0.75 m is the radius of the trajectory
We need to find the speed of the rock. We know that the rock makes a complete circle in t = 2.0 s, and the radius of the circle is r = 0.75, so the speed is equal to the ratio between the distance covered (the perimeter of the circle) and the time taken:
And so, the centripetal force is
<span>A. How could energy become the matter present today? </span>
Answer:
1.8 × 10^29 kg
Explanation:
The computation of the total mass is shown below;
As we know that
The total mass of the sun is
= 2 × 10^30 kg
Since 70% of the mass involves hydrogen gas, so total mass of the hydrogen gas is
= 70% × 2 × 10^30 kg
= 1.4 × 10^30 kg
And, 13% available for fusion, so the hydrogen gas mass is
= 13% × 1.4 × 10^30 kg
= 1.8 × 10^29 kg