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A short electric dipole is placed in the electric field due to a point charge. Then (A) The dipole must experience a force (B) The dipole may experience a force (C) The dipole must experience a torque (D) The dipole may experience a torque

In the Coolidage tube experiment, if the applied voltage is increased to three times, the short wavelength limit of continuous X- ray spectrum shift by 20 pm. What is the intial voltage (in kV) applied to the tube?