The two long straight wires are separated by a distance of d = 0.40 m. The currents are to the right in the upper wire and to th
e left in the lower wire. What is the direction of the magnetic field at point P, that is a distance d/2 below the lower wire?
1 answer:
Answer:
Out of the page
Explanation:
At point P, Using right hand rule, the direction of magnetic field due to current flowing towards left in lower wire comes out to be in outward direction.
At point P, Using right hand rule, the direction of magnetic field due to current flowing towards right in upper wire comes out to be in inward direction.
we know that magnetic field at a point by a long current carrying wire depends inversely on the distance from the wire. hence greater the distance, weaker will be the magnetic field.
Since point P is farther from upper wire and closer to lower wire, the magnetic field in Outward direction by the lower wire is stronger as compared to the magnetic field by the upper wire in inward direction.
hence magnetic field at point P comes out to be in Outward direction.
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Answer:
The effective spring constant of the firing mechanism is 1808N/m.
Explanation:
First, we can use kinematics to obtain the initial velocity of the performer. Since we know the angle at which he was launched, the horizontal distance and the time in which it's traveled, we can calculate the speed by:
(This is correct because the horizontal motion has acceleration zero). Then:
Now, we can use energy to obtain the spring constant of the firing mechanism. By the conservation of mechanical energy, considering the instant in which the elastic band is at its maximum stretch as t=0, and the instant in which the performer flies free of the bands as final time, we have:
Then, plugging in the given values, we obtain:
Finally, the effective spring constant of the firing mechanism is 1808N/m.
Answer:
(C) Only if it starts moving
Explanation:
We know that work done is given by
So there are two case in which work done is zero
First case is that when force and displacement are perpendicular to each other
And other case is that when there is no displacement
So for work to be done there must have displacement, if there is no displacement then there is no work done
So option (c) will be the correct option