21.
A conductor 4 m long lies along x-axis with a current of 10.0 A in the $${\hat i}$$ direction. The force on this conductor due to a magnetic field $$B = 0.05\hat kT$$   is

24.
A copper rod of length L is rotated about one end perpendicular to the uniform magnetic field B with constant angular velocity ω. The induced emf between the two end is

25.
Consider a closed surface S surrounding a volume V. If \[\overrightarrow r \] is the position vector of a point inside S, with \[{\hat n}\] the unit normal on s, the value of the integral \[\mathop{{\int\!\!\!\!\!\int}\mkern-21mu \bigcirc}\limits_S {5\overrightarrow r .\hat ndS} \]   is

27.
The depth of penetration is the depth in which electromagnetic wave has been attenuated to

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