Bihar Board Class 12 (Science) Magnetism and Matter — practice questions
71 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice Bihar Board Class 12 (Science) Magnetism and Matter in the app →A bismuth bar near a strong magnet on the lab table is:A freely suspended bar magnet settles pointing:The tip of a magnet pointing to geographic north is its:Cutting a bar magnet in half gives:Magnetic field lines of a bar magnet form:A bar magnet behaves like a magnetic:Substances repelled by a magnetic field are:Materials are classified by which quantity?Substances that are weakly magnetised in a field are:Substances that are strongly magnetised in a field are:A ferromagnet is divided internally into regions called:In an unmagnetised ferromagnet, the domains are:Applying a field makes the domains:Above a certain temperature, a ferromagnet becomes a:The Earth's magnetic field runs approximately from geographic:A bar magnet can be modelled as a large number of:The magnetic moment of a bar magnet equals that of an equivalent:Inside a diamagnetic material, the field is:Diamagnetism arises in atoms whose electrons have no net:Field lines of a bar magnet differ from an electric dipole's because they:The word magnet comes from the name of an island in which country?What are isolated north or south magnetic poles called?A bar magnet is cut into two halves. What results?Why can two magnetic field lines never intersect?Where field lines are crowded together, what can be said of the magnetic field?The far axial field of a short bar magnet varies with distance r as:A magnetic needle of moment m makes angle theta with field B. What is the torque on it?At what angle between m and B is a dipole in stable equilibrium?What is the maximum magnetic potential energy of a dipole m in a field B?With zero integration constant, U = 0 at which needle orientation?In the analogy of electric and magnetic dipoles, the electric dipole moment p corresponds to:For a short bar magnet, how does the axial field compare with the equatorial field at the same large distance?If monopoles existed, the closed-surface flux of B would equal:Why is it misleading to call magnetic field lines lines of force?Magnetisation M of a sample is defined as its:In what unit is magnetic intensity H measured?Which relation connects B, H and M inside a magnetic material?The magnetic susceptibility of a material is:A material has susceptibility 4 x 10^-4. What is its relative permeability?Which sign and size of susceptibility does a diamagnetic material have?The relative permeability is the magnetic analog of which electrostatic quantity?A solenoid core has relative permeability 200 and H = 2000 A/m. What is B in the core?A core of relative permeability 400 sits in a field with H = 2000 A/m. Its magnetisation is about:Which kind of material has a large positive susceptibility?A paramagnetic substance has relative permeability that is:In a non-uniform field, diamagnetic substances tend to move:Which of these substances is diamagnetic?Diamagnetism is found in:Atoms of a diamagnetic substance have a resultant magnetic moment that is:Which law explains why electrons slow down or speed up in diamagnetism?The typical reduction of field inside a diamagnetic bar is about one part in:Magnetisation of a paramagnet increases when the temperature is:Saturation of a paramagnetic sample means:Roughly how many atoms does a typical ferromagnetic domain contain?Which one is a hard ferromagnetic alloy used for permanent magnets?Which material loses its magnetisation when the external field is removed?The relative permeability of a ferromagnetic material is typically:When an external field acts on a ferromagnet, domains aligned with the field:Along a bar magnet, where is the magnetic field intensity strongest?Which source of magnetic field has no north or south pole?Ampere's hypothesis explains all magnetic phenomena through:The link between moving charges and magnetic fields was discovered in the:A magnetised needle in a uniform field feels torque but no net force becauseThe potential energy of a magnetic dipole in a field is taken as zero when the angle between m and B isTwo magnetic field lines never cross because at the crossing pointA dipole of moment 3 A m^2 is turned from the stable to the unstable position in a 0.2 T field. The energy neeThe magnetic intensity H has the same unit as which quantity?For a diamagnetic material in an external field, the magnetisation M isTwo identical iron bars repel at some pair of ends. This shows thatAn iron nail near a bar magnet feels a net attraction becauseWhy is the phrase magnetic lines of force avoided for field lines?