Which of the following devices does NOT utilise the magnetic efffects of electric current?
Magnetic compass
The correct answer is Option 1 i.e. Magnetic compass.
The device that does not utilize the magnetic effects of electric current is the magnetic compass.
Other options:
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Microphone – Uses a diaphragm attached to a coil in a magnetic field. When sound waves vibrate the diaphragm, the coil moves, inducing an electric current (electromagnetic induction).
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Electric Motor – Works on the principle of the magnetic effect of current, where a current-carrying coil in a magnetic field experiences a force, causing rotation.
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Electric Generator – Operates via electromagnetic induction, where mechanical energy rotates a coil in a magnetic field, generating electricity.
The magnetic compass, however, relies on Earth's natural magnetic field to align its needle (a permanent magnet) and does not require an electric current to function. Thus, it does not use the magnetic effects of current.
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Important Questions from Atomic Structure
Which of the following pairs of 'number – composition' is correct?
I. Atomic number – number of protons
II. Mass number – Sum of number of neutrons and protons
What is the atomic number of Bohrium which is named after physicist Niels Bohr, one of the founders of quantum theory?
The quantum numbers n and l for four electrons are given below.
(i) n = 4, I = 1
(ii) n = 4, l = 0
(iii) n = 3, l = 2
(iv) n = 3, l = 1
The order of their energy from lowest to highest is:
The de-Broglie wavelength of a particle of mass 0.001 kg and moving with velocity 100 m/s is given by:
What is the increasing order for the values of e/m for
