1.(a)define magnetic line of force
(b)A wire of lengthen MC's trying a currently 4.0A is placed between the poles
of a powerful electromagnet of magnetic flux density 2.0T.calculatethe()force
on the wire when it's parallel to the field(ii)maximum force on the wire(iii)force
on the wire when it makes an angle offbeat HGH(c)Describe how keepers
can be used to preserve the magnetic strength of permanent bar magnet.
(d)A sailor serves that his marine recompose N10 Wat a place where the angle of declination is #15W.Calcuatethetruebearingoftheplace.
(a) Magnetic lines of force are imaginary lines used to represent the direction and strength of a magnetic field. They indicate the path a free north pole would follow in the field.
(b)
(i) The force on the wire when it is parallel to the field can be calculated using the formula F = BIL, where B is the magnetic flux density (2.0T), I is the current (4.0A), and L is the length of the wire.
F = 2.0 * 4.0 * L
F = 8.0L N
(ii) The maximum force on the wire occurs when it is perpendicular to the field. In this case, the force will be F = BIL, with B and I remaining the same. The length of the wire will be the maximum possible length, so the maximum force will be F = 2.0 * 4.0 * L_max.
(iii) The force on the wire when it makes an angle theta (HGH) with the magnetic field can be calculated using the formula F = BILsin(theta).
(c) Keepers can be used to preserve the magnetic strength of a permanent bar magnet by ensuring that the magnet retains its magnetic properties over time. This is done by placing magnetic keepers, typically made of soft iron, across the poles of the magnet to complete the magnetic circuit and prevent any loss of magnetism.
(d) The sailor should adjust the ship's compass by the angle of declination to find the true bearing of the place. The true bearing is the compass bearing corrected for the magnetic declination. In this case, the true bearing would be N10E (10 degrees east of north) when the angle of declination is 15 degrees west.