In the given figure: CP, CQ are tangents to a circle with center O. ARB is another tangent touching the circle at R. If CP = 11 cm, BC = 7 cm. Length of BR is :
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Q3
___ is the average distance between the center of the sun, measured from the center of the earth.
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Q4
The distance of two points on the axis of a magnet from its center are 10cm . The ratio of magnetic field at these points is 12.5:1. The length of the magnet is :
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Q5
In a biprism experiment, the distance of 20 th bright bandfrom the center of the interference pattern is 8mm . The distance of 30th bright band from the center is