Physics
The strength of an electromagnet can be increased by

Increasing current supply
Increasing the number of turns
Increasing the length of the coiled wire
All of these

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Physics
Which one of the following statements with regard to Jet stream, an upper level tropospheric wave, is not correct?

In summer, the polar front jet achieves its maximum force.
It follows the wave path near the tropopause at elevations of 8 km to 15 km.
It is narrow band of high-velocity wind.
Jet streams are typically continuous over long distances.

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