Physics
A copper rod PQ carrying current is kept in a magnetic field as shown in the diagram.
(a) The copper rod PQ will move towards C. State True or False.
(b) Name the law used to determine the direction of motion of PQ.
(c) What will be the effect on the force experienced, if the rod PQ is replaced by another copper rod of same length but of greater cross-sectional area?
(d) Justify your answer in (c).
Electro-Magnetism
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Answer
(a) The statement is true. as the magnetic field is upward to downward direction and the direction of current is from left to right so, the rod PQ will experience a force towards C. So, PQ will move towards C.
(b) Fleming’s left hand rule.
(c) If the replaced copper rod has same length but greater cross-sectional area then the resistance of this rod will be lower than the previous rod. So, the current through the new rod will be more than the previous one. Hence, the force experienced will also be more.
(d) As force experienced is directly proportional to the applied current so if current increases, then force obviously increases.
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