Resistivity of rubber is about 102 ?-m 10-2 ?-m 5 x 108 ? m 5 x 1012 ?-m

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5 x 10¹² ?-m

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4. 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
Options
A.
B.
C.
D.

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

6. In terms of classical representation of electrons
Options
A. an atom is essentially empty
B. an atom is essentially full
C. an atom may be essentially empty or full depending on the material
D. an atom may be essentially empty or full depending on temperature

8. Assertion (A): For a magnetic material M = (?_r - 1) H, where M is magnetic dipole moment/m³, H is field intensity A/m and ?_r is relative permeability.
Reason (R): ?_r can have any value from 0 to hundreds of thousands.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

10. High frequency inductors and capacitors are commonly plated with silver. The main purpose of this is to
Options
A. reduce dc resistance
B. reduce ac resistance
C. increase dc resistance
D. increase ac resistance

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