Answer:(b)
Explanation:
Given
Electric current flowing through the horizontal wire towards the observer's face.
The direction of the magnetic field is given by the right-hand thumb rule, i.e. place the thumb in the direction of current and the wrapping of fingers will give the direction of the magnetic field
the direction of the magnetic field will be counterclockwise as observed by an observer.
Answer:
Explanation: according to Coulomb's inverse-square law is proportional to the square of distance between them and is given by
![F=k\frac{q_0q_1}{r^2}](https://tex.z-dn.net/?f=F%3Dk%5Cfrac%7Bq_0q_1%7D%7Br%5E2%7D)
where r is the distance between the charges & k is the Coulomb's constant
k=1/(4*ε_0*π)
k=9*10^9
the distance between the charges in this question is d_1
hence the magnitude of the force exerted by q_0 on q_1 is given by
![F=k\frac{q_0q_1}{d_1^2}](https://tex.z-dn.net/?f=F%3Dk%5Cfrac%7Bq_0q_1%7D%7Bd_1%5E2%7D)
due to location of particle 1 above the particle 0 the direction of force is parallel to y axis and in vector form
![F=k\frac{q_0q_1}{d_1^2} j](https://tex.z-dn.net/?f=F%3Dk%5Cfrac%7Bq_0q_1%7D%7Bd_1%5E2%7D%20j)
D. A magnetic field created by the electric current causes the compass needle to move.
<u>C</u> is the correct answer, because energy cannot be created neither destroy. The energy is changing from chemical to from electric to light, and from light to heat.
Answer:
(C) Only if it starts moving
Explanation:
We know that work done is given by
![W=F.d=Fdcos\Theta](https://tex.z-dn.net/?f=W%3DF.d%3DFdcos%5CTheta)
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