Question
Calculate the perimeter of a circular field with an area
of 3675 square meters, using an approximation of π as 3.Solution
Let the radius of the circular field = r m So the area of the circular field = π × r2 = 3675 r2 = 1225, r = 35 So the circumference of the circular field = 2 × 3 × 35 = 210 m
 The radii of curvature of the faces of a double convex lens are 20 cm and 30 cm. If focal length of the lens is 36 cm find the refractive index of t...
A sphere of radius 1m encloses a charge of 10μC. Another charge of −5μC is placed inside the sphere. The net electric flux would be :
Which lens is used to correct myopia (shortsightedness)? Â
Which of the following is a characteristic of a conductor? Â
Two spherical conductors of radii 2 cm and 8 cm are connected. The ratio of charges on them at equilibrium is:
Light from a point source in air falls on a spherical glass surface (n=1.5 c and radius of curvature = 10 cm). The distance of the light source from the...
Why does a fountain pen leak on an airplane flying at high altitude?
Which of the following is an example of longitudinal waves in a gas medium?
An object moves towards a convex lens of focal length 20 cm with a velocity of 5 cm/s. When the object is at 30 cm from the lens, find the rate at which...
The energy emitted by the Sun is due to
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