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 uses bismuth for its core , will the field in the core be greater or less than when the core is empty .

Atomic radius of Ga is slightly less than that of Al. The reason is-

A solenoid with an iron core and a bulb are connected to a.d.c.source. How does the brightness of the bulb change, when the iron core is removed from the solenoid?

A solenoid carrying a current supplied by a DC source with a constant emf contains an iron core inside it. How will the current change when the core is pulled out of the solenoid: will it increase, decrease, or remain the same?

Energy content of alcohol is 7.1 kcal/gm. It is more than carbohydrates and slightly less than facts. Intake of alcohol provides

Is the internal energy of a system at 25^(@)C greater or less than its internal energy at 50^(@)C ?

If the process AtoB occurs reversible, then the change in entropy of the system be, DeltaS_(1) . When the same process occurs irreversible, the change in entropy of the system be DeltaS_(2) . Will the value of DeltaS_(1) be greater than, less than or equal to the value of DeltaS_(2) ?

A toroid has a core( non-ferromagnetic) of inner radius 25 cm and outer radius 26cm, around which 3500 turns of a wire wound. If the current in the wires is 11A, what is the magnetic field inside the core of the toroid, and