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Question

Equation of the hour hand at 4 O’ clock is

A
x3y=0
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B
3xy=0
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C
x+3y=0
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D
3x+y=0
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Solution

The correct option is C x+3y=0
Since the hour, minute and second hands always pass through origin because one end of these hands is always at origin. Now at 4 O' clock, the hour hand makes 30 angle in fourth quadrant. So the equation of hour hand is


y=mxy=13xx+3y=0

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