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Positively charged.
Thompson observed that these rays are negatively electrically charged.
Because their where negative charges or particles in the beam
It doesn't really "become" charged. An electron is always charged, and it can only have a charge of -e where value of elementary charge e is 1.602 * 10-19 C as found first by Millikan with his famous oil drop experiment
He sent a cathode ray between electrically charged metal plates.
Rutherford used the gold foil experiment to figure out that an atom had charged particles in the nucleus
th gold foil experiment
th gold foil experiment
th gold foil experiment
Bohr
putangina Mu
detect charged particles
th gold foil experiment
Positively charged.
The gold foil experiment demonstrated this.
Thompson observed that these rays are negatively electrically charged.
Ernest Rutherford