Electricity And Magnetism

Q: The strength of magnetic field around a straight conductor:

(a) :  Is same everywhere around the conductor
(b) :  Obeys inverse square law
(c) :  Is directly proportional to the squrae of distance from the conductor
(d) :  None of these
(e) :  None of the Above
Answer:  None of these
Explanation:  

Q: The direction of magnetic lines of force around a current carrying wire is given by:

(a) :  Faraday's Law
(b) :  Head to tail rule
(c) :  Right hand rule
(d) :  Both (a) and (b)
(e) :  None of the Above
Answer:  Right hand rule
Explanation:  

Q: Magnetic induction is defined as flux per unit area of the surface which is :

(a) :  parallel to B→
(b) :  Prependicular to B→
(c) :  At an angle 60o to B
(d) :  Any of A or B
(e) :  None of the Above
Answer:  Any of A or B
Explanation:  

Q: The magnitude of induced emf depends upon the:

(a) :  Rate of decrease of magnetic field
(b) :  Rate of change of magnetic field
(c) :  Rate of increase of magnetic field
(d) :  Constancy of magnetic field
(e) :  None of the Above
Answer:  Rate of change of magnetic field
Explanation:  

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