A material has N spins per m3. If Np are the dipoles per m3 parallel to field an

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A material has N spins per m³. If N_p are the dipoles per m³ parallel to field and N_a are the dipoles per m³ anti-parallel to field, the magnetisation is
Options
A.
B.
C.
D.

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1. For a multiplate capacitor having n plates, A as area of each plate, the capacitance is proportional to
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A. n A
B. (n - 1) A
C. (n + 1) A
D.

5. In a specimen of silicon steel, a field strength of 200 A/m causes a flux density of 0.5 T. In a specimen of cast iron, the same H would cause B to be
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A. 0.5 T
B. less than 0.5 T
C. more than 0.5 T
D. 0.5 T or more or less

7. The electric dipole moment of a neutral system of point charges Q₁, Q₂.... is Q_ir_i . The charges Q_i
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A. must be all positive
B. must be all negative
C. must be such that Q_i = 0
D. either (a) or (b)

8. If m, v, r are the mass, velocity and radius of orbit of electron and h is Planck's constant, quantum condition for electron's orbit is
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A.
B.
C.
D.

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