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# Physics II Lab w answers_Part_20 - used in a CRT Estimate...

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51 used in a CRT? Estimate the velocity ‘v o ’ of the electron. 2. What will happen to the spot if a sinusoidally time varying voltage is applied to the deflecting plates VV / or HH / ? What will happen if such a voltage (of the same frequency) is applied simultaneously to the horizontal and vertical deflecting plates? 3. Draw a neat diagram showing the 3-dimensional orientations of vectors of the electron’s horizontal velocity, the electric field, the magnetic field the electric force on the electron and the magnetic force as the electron moves in the CRT. Orient your diagram according to the experimental set-up. 4. If the deflecting voltage is switched off but the bar magnets kept in place, will there be a deflection of the spot? Describe qualitatively the motion of the electron in the CRT from aperture to screen. 5. Describe the motion of the electron in the CRT in the presence of the deflecting voltage magnetic fields of the magnets 6. What is the effect of earth’s magnetic field on the electron motion? What would happen if the apparatus were rotated by 90 0 so that the CRT is along the EW direction? 7. Consider a dipole aligned with a magnetic field .If the dipole is given a small angular displacement, then it experiences a restoring torque ‘

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Physics II Lab w answers_Part_20 - used in a CRT Estimate...

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