The typical output characteristics curve for a transistor working in the common-emitter configuration is shown in the figure.


The estimated current gain from the figure is __________.

The projectile motion of a particle of mass 5 g is shown in the figure.


The initial velocity of the particle is $$5\sqrt 2 $$ ms^-1 and the air resistance is assumed to be negligible. The magnitude of the change in momentum between the points A and B is x $$\times$$ 10^-2 kgms^-1. The value of x, to the nearest integer, is __________.

An infinite number of point charges, each carrying 1 $$\mu$$C charge, are placed along the y-axis at y = 1 m, 2 m, 4 m, 8 m ...............

The total force on a 1C point charge, placed at the origin, is x $$\times$$ 10³ N.

The value of x, to the nearest integer, is __________. [Take $${1 \over {4\pi {\varepsilon _0}}} = 9 \times {10^9}$$ Nm²/C²]