13 - Moving charge magnetism and force in magnetic field Questions Answers

M2=(2)M1

B = 4×{ (μ₀I) / 2πR } × [sinθ₁+ Sinθ₂]  ...........................Where I= Current , R= parralel distance to the point from the wire

= 4×(4π × 10^-7×10) / 2π*0.7071) × [sin45 + Sin45]

=159.52 × 10^-7 T

= 1.595 × 10^-5 T

u can refer ncert physics class 12 for this topic

well some points are

The axis of the huge magnet assumed to be lying inside the earth is called magnetic  axis of the earth. The points where the magnetic axis cuts the surface of earth are called magnetic poles. The circle on the earth's surface perpendicular to the magnetic axis is called magnetic equator

Angle of inclination or Dip (ø): It is the angle between the direction of intensity of total magnetic field of earth and a horizontal line in the magnetic meridian

 A vertical plane passing through the geographical axis is called geographical meridian

the resultant dipole moment is √2M  thus  the resultant magnetic  field is  μ2√2M/4πd²   (ans)

U=qV
loss of P.E. = gain in K.E.
on passing from one dee to another , PE lost = qv
in one round , it passes 2 times, so total PE lost = 2qV
therefore, KE = 2qV
in n rounds, KE gained = 2nqV