Exercise: Materials And Components

Questions for: Materials And Components

Assertion (A): Magnetic susceptibility of copper is -0.5 x 10-5.

Reason (R): Copper is diamagnetic material.

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
Answer: A

If magnetic susceptibility is very low μ, is nearly equal to 1 and the material is diamagnetic.

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If there are no permanent dipoles in a dielectric material, the dielectric constant is independent of temperature.
A:
True
B:
False
C:
D:
Answer: A
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As regards ferromagnetic Curie temperature Qf and paramagnetic curie temperature θ
A:
Qf > θ
B:
θ > Qf
C:
θ equal to or less than Qf
D:
θ may be equal to less than or more Qf
Answer: B
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Figure shows a composite capacitor. If CA, CB, CC are the capacitances of capacitors A, B, C, the overall capacitance C is
A:
C = CA + CB + CC
B:
C = (CA + CB) CC
C:
C =
D:
C =
Answer: C

B and C are in series and A is in parallel with this combination.

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An electrolytic capacitor can be used for
A:
ac only
B:
dc only
C:
both ac and dc
D:
high frequency ac
Answer: B
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