Physics Test - 3

Reading of potentiometer is accurate because during taking reading it does not draw any current from the circuit.

An electric dipole is defined as a couple of two equal and opposite charges separated by a distance.

An electric dipole always experiences a torque when placed in uniform as well as in non-uniform electric field. But in a non-uniform electric field, an electric dipole also experiences a net force of attraction.

X₁ = X_{5th dark} = (2 x 5 -1)$\frac{\lambda D}{2d}$

X₂ = X_{8th bright} = 8$\frac{\lambda D}{\mu d}$ 

X₁ = X₂

$\frac{9}{2}\frac{\cancel{\lambda \cancel{D}}}{\cancel{d}}=8\frac{\cancel{\lambda \cancel{D}}}{\mu \cancel{d}}$

$\mu =\frac{16}{9}=1.78$

The force responsible for changing the state of motion of objects in contact is called the force of friction. It always acts on all moving objects.

Newton’s Third Law states that “To every action, there is an equal and opposite reaction”. When a gun is fired, it thus recoils and while we swim we exert force on the water which exerts force on us, due to which we move forward. 

According to the formula for time period of a simple pendulum-

$T=2\mathrm{\pi }\sqrt{\frac{\mathrm{l}}{\mathrm{g}}}$

$T$ depends directly on $\sqrt{l}$

On reducing the length to its half,

$l_1=\frac{l}{2}$   where $l_1$ is the new length.

$T_1=2\mathrm{\pi }\sqrt{\frac{\mathrm{l}}{2\mathrm{g}}}$   where $T_1$ is the new time period

$T_1=\frac{1}{\sqrt{2}}\times 2\mathrm{\pi }\sqrt{\frac{\mathrm{l}}{\mathrm{g}}}$

$T_1=\frac{1}{\sqrt{2}}T$

The new time period of oscillation becomes $\frac{1}{\sqrt{2}}$ times the initial time period.

Acceleration. weight lessens experienced while orbiting the Earth in because it will develop the centripetal force due to the center of gravity.

If we throw a Stone with some speed in a horizontal direction it follows a curved path as it falls to the ground.The combination of an initial forward velocity and the downward vertical force of gravity causes the ball to follow a curved path. The two balls fall with the same acceleration and strike the ground at the same time.

$H=H_1+H_2$

$=\frac{K_{1}A\left(T_1-T_2\right)}{d}+\frac{K_{2}A\left(T_1-T_2\right)}{d}$

$\frac{K_{EQ}2A\left(T_1-T_2\right)}{d}+\frac{A\left(T_1-T_2\right)}{d}\left[K_1+K_2\right]$

K_EQ = $\left[\frac{K_1+K_2}{2}\right]$ 

Violet has the smallest wavelength