Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
maximum motor force if the current reverses its direction
no motor force of it is parallel to the field
no motor force if it is perpendicular to the field
a motor force with constant direction if either the current or the magnetic field is reversed
Correct answer is B
The greatest force is experienced when the conductor is at right angle to the field.
I.e at perpendicular or Ø = 90°
photoelectric effect
heisenberg's uncertainty principle
compton effect
wave-particles paradox
Correct answer is A
The photoelectric effect is the emission of electrons when electromagnetic radiation, such as light, hits a material
ferrite substance
paramagnetic substance
ferromagnetic substance
diamagnetic substance
Correct answer is A
Ferrite magnets are non-conductive aferromagnetic ceramic compounds derived from iron oxides such as Haematite (Fe203) or Magnetite (Fe304) and other metal oxides such as Barium and Strontium.
Ferrite is a polycrystal, sintered material with high electrical resistivity. The high resistance of ferrite makes eddy current losses extremely low at high frequencies.
The period of a 10 kHz radio wave traveling at 10\(^{8}\) ms\(^{-1}\) is--
3.0 x 10\(^{-5}\)s
1.0 x 10\(^{-4}\) s
1.0 x 10\(^{4}\)s
3.0 x 10\(^{4}\)s
Correct answer is B
The relation between period and frequency is that one is the inverse of the other.
By definition:
Frequency = 1/period.
or
period = 1/frequency → 1/ 10,000
period = 0.0001 or 1.0 x 10\(^{-4}\) s
move in a circle
repel each other
remain stationary
attract each other
Correct answer is D
Two conductors with current flowing in the same direction will attract.