Physics Test - 4

In an automobile, the power is transmitted from the gear box to the differential through Knuckle joint

In wind power, Kinetic energy form of energy is converted into electrical energy.Wind turbines convert the kinetic energy in the wind into mechanical power. A generator can convert mechanical power into electricity. Mechanical power can also be utilized directly for specific tasks such as pumping water.

$Y=\overline{A+B}$

Focal length of  a convex lens is maximum for Red light.Focal length of convex lens is directly proportional to wavelength of light passed. As red light has higher wavelength, it refracts less and has greater focal lens. On the contrary, blue light converges more and has small focal length.

Hydraulic brakes work on the principle of Pascal’s law which states that “pressure at a point in a fluid is equal in all directions in space”. According to this law when pressure is applied on a fluid it travels equally in all directions so that uniform braking action is applied on all four wheels. The hydraulic brake is an arrangement of braking mechanism which uses brake fluid, typically containing ethylene glycol, to transfer pressure from the controlling unit, which is usually near the operator of the vehicle, to the actual brake mechanism, which is usually at or near the wheel of the vehicle.

Displacement is a vector quantity while the rest are scalar

It is used to measure high temperature 

An electric dipole is placed in varying electric field experiences a torque and a net force.

Electric dipole a couple formed from two equal opposite charges \(q\) and \(-q\), which are separated by a distance \(2 \mathrm{a}\).

• When an electric dipole is placed in a uniform electric field of intensity E, the negative and positive charges experience two forces \(-q E\) and \(+q E\) respectively. These two forces are opposite and hence, the net force the dipole experiences will be zero. However, Since they are separated by a distance, a torque is produced.
• In a varying electric field, the force experienced by the two charges of the dipole will be of different magnitudes, and hence, the dipole will experience a net force. Since the charges are separated by a distance, they will experience a torque as before.

According to Newton’s third law of motion - To every action there is an equal and opposite reaction

One angstrom is equal to ${10}^{-10 }m$.