A cup of black coffee cools faster than a cup of black coffee with milk. This is because black coffee...
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Answer:
a)
b) west end of the bar is positive.
Explanation:
Given:
- emf induced in the bar,
- length of the bar,
- velocity of the bar at the given instant,
(a)
The magnitude of the horizontal component of the Earth's magnetic field(B):
We know:
(b)
Using Fleming's left hand rule we determine that the current is flowing towards east end of the bar i.e. west end of the bar is positive.