1.

In the figure shown, there is a magnetic field in the x - direction with |B| = 0.2 T , The loop has an area of 5 cm^(2) and rotates about line CD as z - axis. Point A rotates towards positvie x axis and intially x - axis is perpanedicular to the plane of the loop. If AE rotates through an angle of 30^(@) from the intial position in 0.2 seconds. The change in flux through the coil is

Answer»

1.34 `xx 10^(-5)` Wb
`- 1.34 xx 10^(-5)` Wb
`1.34 xx 10^(-3)` Wb
`-1.34 xx 10^(-3)` Wb

Solution :`B = 0.2hat(i), hat A_(i) = (5)/(10^(4)) HATI m^(2) = hat A_(t) = (5)/(10^(4))[sqrt(3)/(2)hati(1)/(2)HATJ]m^(2).t=0.2` sec


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