Physics
The strength of an electromagnet can be increased by

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

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Physics
Plants are dried up in winter due to frost because

Respiration does not take place at low temperature
Evaporation does not take place
There is mechanical loss of tissues and drought condition prevails
Photosynthesis does not take place at such low temperature

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