Question
For ferromagnetic substances:

Answer

(a)permeability is high and susceptibility is high and positive

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Mark the correct options:
  1. Gauss's law is valid only for symmetrical charge distributions.
  2. Gauss's law is valid only for charges placed in vacuum.
  3. The electric field calculated by Gauss's law is the field due to the charges inside the Gaussian surface.
  4. The flux of the electric field through a closed surface due to all the charges is equal to the flux due to the charges enclosed by the surface.
To convert galvanometer into voltmeter one should connect:
Three capacitors of capacitances $3\ \mu F, 9\ \mu F$  and $18\ \mu F$  are connected once in series and another time in parallel. The ratio of equivalent capacitance in the two cases $(\frac{ C _{ s }}{ C _{ p }})$ will be