Pretend you tip the apparatus up at an angle so that the face of the Helmholtz c

Question

Pretend you tip the apparatus up at an angle so that the face of the Helmholtz coil is parallel to the direction of the earth's magnetic dip angle. (By "face of the Helmholtz coil" we mean the Area Vector is parallel to Earth's Magnetic Field Vector.) The controls are now pointed down towards the table. What would the effect be on the beam of electrons? (Assume you have not changed V or I.) The diameter would increase. The diameter would be half as big. The diameter would decrease. The diameter would be twice as big. There is not enough information to know the effect. The diameter would stay the same.

Explanation / Answer

we know that F=qvB=mv2/r

hence r=mv/Bq          if we increase the value of B then radius will be small and if we decrease the value of B then radius will be larger.

therefore, the diameter would increase

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