Answer the following questions: If a toroid uses bismuth for its core, will the field in the core be (slightly) greater or (slightly) less than when the core is empty?

If a toroid used bismuth for its core, will the field in the core be (slightly) greater or (slightly) less than when the core is empty?

Answer the following question: If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now?

Answer the following questions: A choke coil in series with a lamp is connected to a dc line. The lamp is seen to shine brightly. Insertion of an iron core in the choke causes no change in the lamp’s brightness. Predict the corresponding observations if the connection is to an ac line.

Answer the following questions:The charged currents in the outer conducting regions of the earth’s core are thought to be responsible for earth’s magnetism. What might be the ‘battery’ (i.e., the source of energy) to sustain these currents?

Study the diagram and answer the following questions: What term is used for the process when shifting occurs from A-site to P-site?

Answer the following questions: Magnifying power of a simple microscope is inversely proportional to the focal length of the lens. What then stops us from using a convex lens of smaller and smaller focal length and achieving greater and greater magnifying power?

Answer the following questions: The refractive index of diamond is much greater than that of ordinary glass. Is this fact of some use to a diamond cutter?

Answer the following questions:The earth’s field departs from its dipole shape substantially at large distances (greater than about 30,000 km). What agencies may be responsible for this distortion?

The following graph is another historam (Fig.) From the bars of this histogram, we can answer the following questions : (i) How many teachers are of age 45 years or more but less than 50 years? (ii) How many teachers are of age less than 35 years?