A capacitor can be represented by a capacitance and resistance in parallel. For

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Question
A capacitor can be represented by a capacitance and resistance in parallel. For a good capacitor, this parallel resistance should be
Options
A. negligible
B. low
C. high
D. very high

Correct Answer

very high

Explanation

The dielectric of a good capacitor should have very high resistivity.

Materials and Components problems

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2. Silicon and germanium are elements in the
Options
A. second column of periodic table
B. third column of periodic table
C. fourth column of periodic table
D. fifth column of periodic table

3. Antiferromagnetic materials do not have permanent dipoles.
Options
A. True
B. False

6. When a potential is applied across an intrinsic semiconductor, holes flow
Options
A. towards positive terminal
B. away from positive terminal
C. in the external circuit only
D. none of the above

8. n type semiconductors
Options
A. are negatively charged
B. are produced when indium as impurity is added to germanium
C. are produced phosphorus as impurity is added to silicon
D. none of the above

9. Assertion (A): Acceptor extrinsic semiconductor has higher conductivity than intrinsic semiconductor.
Reason (R): Addition of p-type impurity produces an allowable discrete energy level just above valence band.
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. In the wave mechanical theory, the maximum of the charge distribution in the ground state occurs for a distance from the nucleus equal to
Options
A. first Bohr radius
B. second Bohr radius
C. third Bohr radius
D. either first or second Bohr radius

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