Answer:
w=f×s
w = 16000 J, hope this helps
Answer:
the induced current is 
Explanation:
Given that :
side of the square (l) = 16 cm = 0.16 m
Magnetic field B = 0.750 y² t
Resistance R = 0.500 Ω
Time t = 0.490 s
Let consider a small rectangular; whose length is
and breath is 
Hence; to determine the magnetic flux through it small rectangular; we have:

Let calculate the total flux in the square loop

Thus the total flux in the square loop is 
Now; going to the induced emf; let consider the Faraday's Law




Finally ; the induced current I is given by the expression;


Therefore; the induced current is 
Answer:
<em>12.5watts</em>
Explanation:
Power = Workdone/Time
Since workdone = Force * Distance
Power = Force *distance/Time
Given
Force = 150N
Distance = 10m
Time = 2 minutes = 120seconds
Required
Power
Substitute the given values into the formula;
Power = 150 * 10/120
Power = 1500/120
Power = 12.5Watts
Hence his power is 12.5watts
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The correct answer is:
<span>Point charges must be in a vacuum.
In fact, the usual form for of the Coulomb's law is:
</span>

<span>where
</span>

is the permittivity of free space
<span>q1 and q2 are the two charges
q is the separation between the two charges
However, this formula is valid only if the charges are in vacuum. If they are in a material medium, the law is modified as follows:
</span>

where

is the relative permittivity, which takes into account the dielectric effects of the material.
It raises the water level because of the melting glaciers.