(Solved): 2. An electron enters a uniform magnetic field \( (B=0.28 \mathrm{~T}) \) at a \( 45^{\circ} \) ang ...

2. An electron enters a uniform magnetic field \( (B=0.28 \mathrm{~T}) \) at a \( 45^{\circ} \) angle to \( B \). Determine the radius \( r \) and pitch \( p \) of the electron's helical path assuming its speed is \( 3.0 \times 10^{6} \mathrm{~m} / \mathrm{s} \). (43 \( \mu \mathrm{m}, 0.27 \mathrm{~mm} \) ) 3. What value of \( \mathrm{q} / \mathrm{m} \) for a particle that moves in a circle of radius \( 8.0 \mathrm{~mm} \) in a \( 0.46 \mathrm{~T} \) magnetic field if a crossed \( 260 \mathrm{~V} / \mathrm{m} \) electric field will make the path straight? \( (153 \mathrm{kC} / \mathrm{m}) \)