Question
Define two magnetic elements of the earth.
✓
Answer
Declination : The angle between the magnetic meridian and the geographic meridian at a place is called the declination at that place and is denoted by $\alpha$. The magnetic meridian of that earth may be due east or due west of its geographic meridian. Hence, it is expressed as $\alpha^{\circ}$ east or $\alpha^{\circ}$ west. In figure, < GOM, the declination is $\alpha^{\circ}$ east.
Inclination : This is the angle made by the magnetic field of the earth with the horizontal. It is generally denoted by denoted by $\delta$. In figure, < DOA is the angle of dip. The angle of dip at a place is measured by an instrument called dip circle, which has a compass needle that can rotate freely in a vertical plane.
Inclination : This is the angle made by the magnetic field of the earth with the horizontal. It is generally denoted by denoted by $\delta$. In figure, < DOA is the angle of dip. The angle of dip at a place is measured by an instrument called dip circle, which has a compass needle that can rotate freely in a vertical plane.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A rigid wire consists of a semi-circular portion of radius R and two straight sections The wire is partially immersed in a perpendicular magnetic field B, as shown in the figure. Find the magnetic force on the wire if it carries a current i.
According to Maxwell's theory of electrodynamics, an electron going in a circle should emit radiation of frequency equal to its frequency of revolution. What should be the wavelength of the radiation emitted by a hydrogen atom in ground state if this rule is followed?
A cell of emf ‘E’ and internal resistance ‘r’ is connected across a variable resistor ‘R’. Plot a graph showing the variation of terminal potential ‘V’ with resistance R. Predict from the graph the condition under which ‘V’ becomes equal to ‘E’.
Find the time required to liberate 1.0 litre of hydrogen at STP in an electrolytic cell by a current of 5.0A.
What is the effect of heating of a conductor on the drift velocity of free electrons?
Define the term magnetic moment.
Whether the diffraction effects from a slit will be more clearly visible or less clearly, if the slit-width is increased?
A uniform electric field of $10\ NC^{-1}$ exists in the vertically downward direction. Find the increase in the electric potential as one goes up through a height of $50\ cm.$
→Two point charges of $+10 \mu C$ and $-10 \mu C$ are kept at a distance of 40 cm from each other in air.(a) Calculate the electrical potential energy of the system. Assume that the electric potential energy at infinity is zero.(b) Draw the equipotential surface for the system.(c) How much work will have to be done to separateboth the charges of the system to infinity?
→A proton and an a-particle have the same de-Broglie wavelength. Determine the ratio of (i) Their accelerating potentials and (ii) Their speeds.