Magnetism and Electromagnetism
The change of cross-sectional area of conductor in magnetic field will affect

reluctance of conductor
None of these
both of the listed here
resistance of conductor

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Magnetism and Electromagnetism
The left hand rule correlates to

Self induction, mutual induction and direction of force on a conductor
Current, magnetic field and direction of force on a conductor
Current, induced e.m.f. and direction of force on a conductor
Magnetic field, electric field and direction of force on a conductor

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Magnetism and Electromagnetism
In a simple magnetic field the strength of magnet flux

increases continuously from initial value to final value
is constant and has same value in energy part of the magnetic field
decreases continuously from initial value to final value
first increases and then decreases till it becomes zero

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