a. Where on the earth's surface is the value of vertical component of the earth's magnetic field zero ?
b. The horizontal component of the earth's magnetic field at a given place is `0.4xx10^(-4) Wb//m^2` and angle of dip is `30^@` Calculate the value of (i) vertical component (ii) the total intensity of the earth's magnetic field.

Explanation

a. At the equator , the value of vertical component of earth.s magnetic field is zero.
b. i. `Z_E=B_E sin I = 0.4 xx10^(-4) xx tan 30^@ = 0.23 xx10^(-4) Wbm^(-2)`
ii. Total intensity of earth.s magnetic field, `B_E=H_E/(cosI)=(0.4xx10^(-4))/(cos30^@)=0.46xx10^(-4) Wbm^(-2)`