A straight wire $1 \mathrm{m}$ long carries a current of $10 A$ at right angles to a uniform magnetic field of $1 Wb{m}^{-2}$. Find the mechanical force on the wire and the power required to move it at $15 {\mathrm{ms}}^{-1}$ in a plane at right angles to the field.

A wire $AB$AB making an angle of $30°$ with a horizontal is supported by a magnetic field of $0.65 T$, directed normally into the plane of paper. lf the wire carries a current of $5 A$, determine its mass per unit length.

A current of $5.0 A$ exists in the loop shown in Figure. The wire $AB$ has a length of $50 \mathrm{cm}$ and lies in a magnetic field of $0.20 T$. What is the magnetic force acting on the wire?

Find the magnitude of the magnetic force on the segment $PQ$ placed in a magnetic field of $0.25 T$, if a current of $5 A$ flows through it, as shown in Figure.