Electricity And Magnetism

Q: If A→ is vector area and B→ is the magnetic field, the magnetic flux is mathematically defined as:

(a) :  A→. B→
(b) :  A→x B →
(c) :  B→. A→
(d) :  Both (a) and (c)
(e) :  None of the Above
Answer:  Both (a) and (c)
Explanation:  

Q: The force on a current carrying conductor of length L→ placed in a magnetic field B→ depends upon:

(a) :  Angle between L→ and B→
(b) :  Current passing through the conductor
(c) :  Length and megnetic field
(d) :  All of these
(e) :  None of the Above
Answer:  Length and megnetic field
Explanation:  

Q: The current produced by moving a loop of wire across a magnetic field is called:

(a) :  Direct current
(b) :  Induced current
(c) :  Magnetic current
(d) :  Alternating current
(e) :  None of the Above
Answer:  Induced current
Explanation:  

Q: Vector area A→ is a vector whose direction :

(a) :   is along the surface element
(b) :  Prependicular to surface element
(c) :  At an angle 60o to the surface element
(d) :   Depends upon the direction of magnetic field
(e) :  None of the Above
Answer:  Prependicular to surface element
Explanation:  

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