agnetism and K a 0 11 3 c 11 3 11 3 b 11 3 0 d 0 0 19 The
Last updated: 6/10/2023
agnetism and K a 0 11 3 c 11 3 11 3 b 11 3 0 d 0 0 19 The dip angle at a location in southern India is about 18 Then the dip angle in Britain will be a greater than 18 c equal to 18 b lesser than 18 d zero 50 The angle of dip at a certain place where the horizontal and vertical components of the earth s magnetic field are equal is a 30 b 75 c 60 d 45 51 The vertical component of earth s magnetic field at a place is 3 times the horizontal component the value of angle of dip at this place is a 30 b 45 c 60 d 90 52 At a certain location in Africa compass points 12 west of geographic north The north tip of magnetic needle of a dip circle placed in the plane of magnetic meridian points 60 above the horizontal The horizontal component of earth s field is measured to be 0 16 G The magnitude of earth s field at the location is a 0 32 G c 4 2 G a tan 3 c tan 0 5 b 0 42 G d 3 2 G 53 Assume the dipole model for earth s magnetic field B which is given by the vertical component of Ho 2mcos8 and the horizontal magnetic field By 47 Ho msine 41 component of magnetic field By where 8 90 latitude as measured from magnetic equator then the loci of point for which dip angle is 45 b tan 2 d tan 1 b a motion of ions in earth s ionosphere motion of ions in earth s atmosphere motion of ions in earth s lithosphere motion of ions in the space b 0 90 d 90 0 c d 57 In the magnetic meridian of a certain place the horizontal component of earth s magnetic field is 0 25 G and dip angle is 60 The magnetic field of the earth at this location is a 0 50 G c 0 54 G 58 The equatorial magnetic field of earth is 0 4 G Then its dipole moment on equator is a 1 05 x 10 A m c 1 05 x 10 A m 54 The angles of dip at the poles and the equator respectively are a 30 60 c 45 90 b 0 52 G d 0 56 G 59 A compass needle whose magnetic moment is 60 A m pointing geographical north at a certain place where the horizontal component of earth s magnetic field is 40 x 10 Wb m experiences a torque of 1 2 x 103 N m The declination of the place is a 20 b 45 c 60 d 30 MAGNETISATION AND MAGNETIC INTENSITY 60 A magnetising field of 1500 A m produces flux of 2 4 x 10 weber in a iron bar of the cross sectional area of 0 5 cm The permeability of the iron bar is a 245 b 250 c 252 d 255 b 2 05 x 10 A m d 2 05 x 10 A m 55 At a given place on earth s surface the horizontal component of earths magnetic field is 2 10 T and resultant magnetic field is 4 x 105 T The angle of dip at this place is a 30 b 60 c 90 d 45 61 A solenoid has a core of a substance with relative permeability 600 What is the magnetic permeability of the given substance a 20m x 105 NA c 22m x 10 NA b 21mx 10 NA d 24 x 10 NA 62 A permanent magnet in the shape of a thin cylinder of length 50 cm has intensity of magnetisaton 10 A m The magnetisation current is a 5 x 10 A c 5 x 10 A b 6x 10 A d 6 x 10 A 63 A domain in ferromagnetic iron in the form of cu is having 5 x 100 atoms If the side length of t domain is 1 5 um and each atom has a dip moment of 8 x 1024 A m then magnetisation domain is a 11 8 10 A m b 1 18 x 10 Am c 11 8 x 10 A m d 1 18 x 10 Am 56 The earth s field departs from its dipole shape 64 A magnetising field of 2 x 10 A m produ substantially at large distance greater than about 3000 Km The responsible factor for this distortion is magnetic flux density of 8 x T in an iron roc relative permeability of the rod will be c 10 d 10 a 10 b 1