Related Questions

Skin effect occurs when a conductor carries current at _________ frequencies.
A Very low
B Low
C Medium
D High
Our skin, when exposed to excess sunlight, becomes dark. This is because of our skin pigments called
A flavoxanthin
B melanin
C carotene
D Xanthophyll
Which of the following is a good conductor of heat but bad conductor of electricity ?
A Asbestos
B Celluloid
C Straw Board
D Mica
When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon
A The value of current
B The weight of the conductor
C The direction of the conductor
D None of the above
Which of the following is an advantage of stranded conductor over equivalent single conductor ?
A Less liability to kink
B Greater flexibility
C Less liability to break
D All of the above
If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by
A Blv
B Blv2
C Bl2v
D Bl2v2
The weight of an aluminium conductor as compared to a copper conductor of identical cross-section, for the same electrical resistance, is
A 50 %
B 60 %
C 100 %
D 150 %
An uncharged conductor is placed near a charged conductor, then
A the uncharged conductor gets charged by conduction
B the uncharged conductor gets charged by induction and then attracted towards the charging body
C the uncharged conductor is attracted first and then charged by induction
D it remains as such
In electric press, mica is used because it is _______ conductor of heat but/and________ conductor of electricity.
A bad, good
B bad, bad
C good, bad
D good, good
A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be
A Zero
B BLI
C B2LI
D BLI2

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