Inside the bar magnet, the magnetic field points from north to south. Statement A is correct.
Magnetic Field:
It is defined as a vector field or the influence of the magnet on the electric current, charges and ferromagnetic substance.
The strength of magnetic field is depends up on the numbers of magnetic field lines per unit area.
- Magnetic field lines emerge from the North pole and end in the South pole of a bar magnet.
- Inside the magnet are also present inside the bar magnet and never intersect at any point.
Therefore, inside the bar magnet, the magnetic field points from north to south.
To know more about Magnetic Field:
brainly.com/question/19542022
Explanation:
Answer. Due to stroking the piece of steel, the domains which are randomly arranged get aligned in the direction of stroking by the magnet. Due to this alignment of the domains, the piece of steel attains magnetic properties.
Answer:
the voltage across the resistor is V= 0
Explanation:
The correct answer is zero.
The answer is zero because the inductor acts as open circuit.
![i= i_0[1-e^{-\frac{t}{\tau} }]](https://tex.z-dn.net/?f=i%3D%20i_0%5B1-e%5E%7B-%5Cfrac%7Bt%7D%7B%5Ctau%7D%20%7D%5D)
i_o= maximum current
\tau= L/R= time constant
i= current at any instant
![V= V_0[1-e^{-\frac{t}{\tau} }]](https://tex.z-dn.net/?f=V%3D%20V_0%5B1-e%5E%7B-%5Cfrac%7Bt%7D%7B%5Ctau%7D%20%7D%5D)
at t=0 at the moment when contact is made
V=V_o[1-1]
⇒V= 0 V
Let's take the analogy of the baseball pitcher a step farther. When a baseball is thrown in a straight line, we already said that the ball would fall to Earth because of gravity and atmospheric drag. Let's pretend again that there is no atmosphere, so there is no drag to slow the baseball down. Now, let's assume that the person throwing the ball throws it so fast that as the ball falls towards the Earth, it also travels so far, before falling even a little, that the Earth's surface curves away from the ball's path.
In other words, the baseball falls as it did before, but the ball is moving so fast that the curvature of the Earth becomes a factor and the Earth "falls away" from the ball. So, theoretically, if a pitcher on a 100 foot (30.48 m) high hill threw a ball straight and fast enough,the ball would circle the Earth at exactly 100 feet and hit the pitcher in the back of the head once it circled the globe! The bad news for the person throwing the ball is that the ball will be traveling at the same speed as when they threw it, which is about 8 km/s or several times faster than a rifle bullet. This would be very bad news if it came back and hit the pitcher, but we'll get to that in a minute.
Answer:
The magnitude of the magnetic force acting on the wire is zero, because the magnetic field is parallel to the wire.
In fact, the magnetic force exerted by the magnetic field on the wire is
where I is the current in the wire, L the length of the wire, B the magnetic field intensity and the angle between the direction of B and the wire. In our problem, B and the wire are parallel, so the angle is and so , therefore the magnetic force is zero: F=0.
