Q. Consider the statements: (I)If magnetic field, B =0, then magnetic flux is also zero. (II)If magnetic flux, $\phi = 0,$then magnetic field is also zero.
A) (I)is true , (II) may be true
B) Both (I) and (II) are true
C) (I) may be true, (II) is true
D) (I) and (II) both are false
Explanation
(a) If B =0 then $\phi = \mathbf{B.A} = 0.if\ \phi = 0\ then\ \phi = \mathbf{B}.\mathbf{A} = 0,\ \mathbf{B}$ may or may not be zero because angle between B and A may be 90${^\circ}.$
For same part $\phi$ may be positive and for remaining part, it may be negative so that the resultant $\phi$ becomes zero but B is non-zero.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.