The diagram illustrates a cathode-ray tube. The dotted line indicates the route taken by a beam of electrons. The beam strikes the screen at point X and creates a bright spot. P and Q are horizontal plates positioned on either side of the beam. Which change will cause the bright spot to appear at a different position on the screen?
- AApply a voltage between metal plates P and Q.
- BDecrease the positive voltage of the anode.
- CIncrease the positive voltage of the anode.
- DIncrease the voltage between the terminals of the cathode.