In Florida, most of the rocks that are underground are a type of soft, white rock called limestone. If limestone is underwater f
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Magnetic field outside it due to long wire is given by
Magnetic field due to long wire inside wire at any point
Now the ratio of two magnetic field is given by
R = 5.3 mm
Answer: 17.68 s
Explanation:
This problem is a good example of Vertical motion, where the main equation for this situation is:
(1)
Where:
is the height of the ball when it hits the ground
is the initial height of the ball
is the initial velocity of the ball
is the time when the ball strikes the ground
is the acceleration due to gravity
Having this clear, let's find from (1):
(2)
Rewritting (2):
(3)
This is a quadratic equation (also called equation of the second degree) of the form , which can be solved with the following formula:
(4)
Where:
Substituting the known values:
(5)
Solving (5) we find the positive result is: