Physics II Lab w answers_Part_23 - Fig 6 4 Let the DC power...

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57 Fig 6 4. Let the DC power supply to solenoid be switched off to begin with. Switch on the power supply to the CRT. Select the AC supply in the ‘Off’ position .Use the intensity & the focus controls to obtain a point –like spot at the center of the screen. Next select the AC supply in the ‘X’ position and adjust the voltage using the control to get a line on the screen about 1.5 cm long .Using a voltmeter across the terminals of the accelerating voltage supply adjust the control to set the voltage V a =250 V. 5. Switch on the DC power supply to the solenoid .As you increase the voltage the line on the screen shrinks and also rotates. Increase the voltage so that the line shrinks to a point on the screen. This is the focusing effect. If the does not completely shrink to a point in the voltage range available adjust the rheostat position till this is possible. Note down the current I 1 through the solenoid at this point.

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