Magnetic field lines are hypothetical lines which shows the magnetic field around the bar magnet
It is basically the force on a small hypothetical north pole if it is placed near the bar magnet
So if we place a small hypothetical north pole near North pole of bar magnet then it will experience a repulsive force due to north pole so it will be away from the north pole
Similarly if we put the small hypothetical bar magnet near South pole of magnet then it will be attracted towards the south pole then we can say that the magnetic field lines is towards the south pole
So the correct option must be
<u>Arrows point away from north and toward south.</u>
Answer: The changing magnetic field caused by the material's motion induces a current in the coil of wire proportional to the change in field. If a 0 is represented, the magnetic field does not change between the two domains of a bit, so no current is induced as the magnetic material passes the coil.
Answer:
The angle that the door must rotate is 70.5 graus
Explanation:
When the door rotates through and angel X, the magnetic flux that passes through the door decreases from its maximum value to 0.3 of its maximum value
This way,
X = 0.3 Xmax
X = B A cosX = 0.3 B A
or
cosX = 0.3
or
X = 
(0.3) = 70.5
X = 70.5 graus
<span>The quick way to visualize this is to compare isometric and perspective drawings of a cube. In the isometric drawing, all the edges of the cube would be parallel in sets of four. In the perspective drawing, the edges would taper towards one or more vanishing points.
The isometric drawing, being easier to construct, perserving all scales and dimensions, is the preferred method for mechanical drawings, and are practical for use in the shop. The perspective drawing, which are trickier to draw properly, and does not preserve scales and dimensions, is the preferred method for architectural drawings, because they illustrate what the eye actually sees.</span>
