Physics
In a magnetic field, the direction of motion of a current carrying conductor is given by

Kirchoff's law
Maxwell's right hand rule
Lenz's rule
Flemings left hand rule

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Physics
In a bipolar junction transistor

All the three regions (the emitter, the base and the collector) have equal concentrations of impurity
The collector has the least concentration of impurity
The emitter has the least concentration of impurity
The base has the least concentration of impurity

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Physics
In the process of magnetisation of a bar

Only the surface of the bar gets magnetised
Only some parts of the outer layers of the bar get magnetised
Only the ends of the bar get magnetised
The entire bulk of the bar gets magnetised

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