Physics
A parallel-plate capacitor,with air in between the plates, has capacitance C. Now the space between the two plates of the capacitor is filled with a dielectric of dielectric constant 7. Then the value of the capacitance will become

C
C/7
14C
7C

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Physics
Circuit breaker usually operate under

Sub-transient state of short-circuit current
Steady state of short-circuit current
After D. C. component has ceased
Transient state of short-circuit current

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