An alpha particle is projected vertically upward a speed of `3.0 xx 10^4 km s^(-1)` in a region where a magnetic field of magnitude 1.0 T exists in the direction south to north. Find the magnetic force that acts on the a particle.

Explanation

`q = 2xx 1.6 xx 10^(-19) C `,
` v = 3 xx (10 ^4) km/s = 3 xx (10^7) m/s b` ,
` B = I T , F = qBv ` ,
` = 2 xx 1.6 xx 10 ^(-19) xx 10 ^7 xx 1 ` ,
` 9.6 xx 10^(-12) m/s ` .