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General
Easy
Question
A coil having N turns carry a current I as shown in the figure. The magnetic field intensity at point P is
- null
- null
- null
- Zero
The correct answer is: null
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In order to coincide the parabolas formed by singly ionised ions in one spectrograph and doubly ionized ions in the other Thomson’s mass spectrograph, the electric fields and magnetic fields are kept in the ratios 1 : 2 and 3 : 2 respectively. Then the ratio of masses of the ions is
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