Physics miscellaneous
- A current carrying conductor is associated with
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A current carrying conductor, such as a metal wire, will produce a magnetic field around it because of the motion of charge within the wire itself. This motion produces or sets up a magnetic field around the wire in the form of concentric circles. This electromagnetic effect is described in physics by the Biot-Savart Law, an experimentally deduced inverse-square law. The effect is also described by Ampere’s Law, which is derived from the Biot-Savart Law.
Correct Option: C
A current carrying conductor, such as a metal wire, will produce a magnetic field around it because of the motion of charge within the wire itself. This motion produces or sets up a magnetic field around the wire in the form of concentric circles. This electromagnetic effect is described in physics by the Biot-Savart Law, an experimentally deduced inverse-square law. The effect is also described by Ampere’s Law, which is derived from the Biot-Savart Law.
- The motion of a body around a circular path is an example of
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Uniform circular motion occurs when a body moves in a circular path with constant velocity. The acceleration of a body experiencing uniform circular motion is always directed toward the center of the circle (cen
tripetal acceleration orac = v2 r
where v is the body’s velocity, and r is the radius of the circle. This acceleration is constant in magnitude but changes in direction, so, it is variable at every point of the circular path.Correct Option: A
Uniform circular motion occurs when a body moves in a circular path with constant velocity. The acceleration of a body experiencing uniform circular motion is always directed toward the center of the circle (cen
tripetal acceleration orac = v2 r
where v is the body’s velocity, and r is the radius of the circle. This acceleration is constant in magnitude but changes in direction, so, it is variable at every point of the circular path.
- Which one among the following doesn't have any effect on velocity of sound ?
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The speed of sound varies depending on the temperature, pressure, and density of the medium through which the sound waves travel. In most of the cases, it is density which matters. Sound travels faster through denser air (or other material). The density of air is affected by atmospheric pressure, temperature, and altitude.
Correct Option: C
The speed of sound varies depending on the temperature, pressure, and density of the medium through which the sound waves travel. In most of the cases, it is density which matters. Sound travels faster through denser air (or other material). The density of air is affected by atmospheric pressure, temperature, and altitude.
- A small drop of oil spreads over water because :
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Surface tension of oil is smaller than that of water. When oil is dropped on the surface of water, the force stretches the oil drops on all sides. Hence the oil spreads over the surface of water.
Correct Option: B
Surface tension of oil is smaller than that of water. When oil is dropped on the surface of water, the force stretches the oil drops on all sides. Hence the oil spreads over the surface of water.
- The splitting of white light into its components is due to:
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Dispersion is used to separate a beam of white light into its constituent spectrum of colours. This phenomenon leads to rainbow.
Correct Option: D
Dispersion is used to separate a beam of white light into its constituent spectrum of colours. This phenomenon leads to rainbow.
