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The velocity of sound in air is 330 m/s. The r.m.s. velocity of air molecules (γ = 1.4) is approximately equal to -
An electric dipole of moment is placed at the origin along the X-axis. The electric field at a point , whose position vector makess an angle with the X-axis, will make an angle with the -axis, then is ()
A conducting loop of negligible thickness and of radius a = 6 cm, carries a charge of q = 4μC. The electric field (E) on the axis of symmetry of the loop at a distance of x = 8 cm from the centre of loop is
Three concentric spherical metallic shells and of radii and have charge densities and respectively. The potential of and are
In the annual function at a school, 504 children participated.
The ratio of number of girls to the number of boys is 5 : 3 respectively. Out of the total girls, 20% participated in dance and remaining girls participated in solo song, group song and drama in the ratio of 2 : 3 : 4 respectively. Two third of the total boys participated in group song and remaining boys participated in solo song and dance in the ratio 4 : 5 respectively.
Q. What is the approximate percentage of the boys who have participated in dance out of the total number of boys?
The general solution of the differential equation y (x2y + ex)dx – ex dy = 0 is -
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