Physics
The strength of an electromagnet can be increased by

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

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Physics
In total internal reflection, the light travel from

Denser to rarer medium and it occurs with loss of intensity
Rarer to denser medium and it occurs with loss of intensity
Denser to rarer medium and it occurs with no loss of intensity
Rarer to denser medium and it occurs with no loss of intensity

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