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Solution


Q.

A coil is placed in a magnetic field such that the plane of the coil is perpendicular to the direction of the magnetic field. The magnetic flux through a coil can be changed.     [2023]

A. by changing the magnitude of the magnetic field within the coil.
B. by changing the area of the coil within the magnetic field.
C. by changing the angle between the direction of the magnetic field and the plane of the coil.
D. by reversing the magnetic field direction abruptly without changing its magnitude.

Choose the most appropriate answer from the options given below:
1 A and B only  
2 A, B and C only  
3 A, B and D only  
4 A and C only  

Ans.

(2)

ϕ=B→·A→=BAcosθ