If magnetic field in region is given by B = 4i + 8k, then flux passing

1.	If magnetic field in region is given by B = 4i + 8k, then flux passing through a 5 m² area loop will be? A.20i + 40k Wb B.20 Wb C.40 Wb D.30 Wb. ans is c but Φ=BA. so ans should be 20i+40k
Answer» Answer: The flux is $\phi=20i + 40k$ Explanation: GIVEN : If magnetic field in REGION is given by $B = 4i + 8k$ . To FIND : The flux passing through a 5 m² area loop will be? Solution : Flux is DEFINED as the multiple of magnetic field and area perpendicular to magnetic field. So, $\phi=B\times A$ Here, $B = 4i + 8k$ and $A=5m^2$ Substitute in the formula, $\phi=4i + 8k\times 5$ $\phi=20i + 40k$ THEREFORE, The flux is $\phi=20i + 40k$