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# Tag Archives: Arduino

## A spring is held vertically downward and a current is passed through it . Then the length of the spring :

A spring is held vertically downward and a current is passed through it . Then the length of the spring :

A . increases     B. decreases    C . does not change    D the spring oscillates Since the adjacent turns are carrying currents in the same direction (just like two parallel wires) there will be attraction between the turns and therefore the length of the spring

tends to decrease. ## Parallax Method to determine the distance of stars

WHAT IS THE WAY TO MEASURE THE DISTANCE OF DISTANT OBJECTS LIKE STARS WITH THE HELP OF PARALLAX METHOD

Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.

Astronomers use the principle of parallax to measure distances to celestial objects including to the Moon, the Sun, and to stars beyond the Solar System.

See the animation below to understand the parallax method for determining the stellar distances http://spiff.rit.edu/classes/phys240/lectures/parallax/parallax.html

is it the same method that we use in trigonometry ? 