Answer:
(a)
A small aluminium rod suspended horizontally from a stand using two connecting
wires. Place a strong horseshoe magnet in such a way that the rod lies between
the two poles with the magnetic field directed upwards. For this, put the North
Pole of the magnet vertically below and South Pole vertically above the
aluminium rod. Connect the aluminium rod in series with a battery, a key and a
rheostat.
Pass a current through the
aluminium rod from one end to other (B to A). The rod is displaced towards
left. When the direction of current flowing through the rod is reversed, the
displacement of rod across towards right.
(b) Fleming's left-hand
rule.
Stretch the thumb, forefinger
and middle finger of your left hand such that they are mutually perpendicular
to one another. If the forefinger points in the direction of magnetic field and
the middle finger in the direction of current, then the thumb will points in
the direction of motion or the force acting on the conductor.
(c) According to Fleming's
left hand rule, the direction of force is perpendicular to the direction of
magnetic field and current. We know that the direction of current is taken
opposite to the direction of motion of electrons. Therefore, the force is
directed upwards from the plane of the paper.
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