B) low energy, because red is on the far left of the electromagnetic spectrum.
Observe that the given vector field is a gradient field:
Let , so that
Integrating the first equation with respect to , we get
Differentiating this with respect to gives
Now differentiating with respect to gives
Putting everything together, we find a scalar potential function whose gradient is ,
It follows that the curl of is 0 (i.e. the zero vector).
Explanation:
the question it's not complete as I don't know the height as the formula for potential energy is : <u>PE = </u><u>mgh</u>
<em>(m) - mass acceleration due to gravity </em>
<em>(g) - acceleration due to gravity </em><em> </em><em>(</em><em>9</em><em>.</em><em>8</em><em> </em><em>m</em><em>/</em><em>s2</em><em>)</em>
<em>(h) - height</em>
Answer:
c. clockwise
Explanation:
This is because, the magnetic field, B produced due to the downward flowing current in the straight wire is perpendicular to the plane of the rectangular conducting loop and directed outwards from it.
Since it also decreases as it goes from the top of the loop to the bottom of the loop (and also from left to right since B ∝ 1/r), there is a change in magnetic flux which is negative, and thus and induced emf or current is generated to oppose this change in magnetic flux which is generating the current according to Lenz's law. To generate a magnetic field in the opposite direction to that due to the straight wire, a current flowing in the clockwise direction must be generated in the loop.
So the answer is C. clockwise.
Most experiments are done in a laboratory