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				| 1. | A particle having the same charge as of electron moves in a circular path of radius 0.5 cm under the influence of a magnetic field of 0.5 T. If an electric field of 100 V/m makes it to move in a straight path, then the mass of the particle is (Given charge of electron = 1.6 × 10-19 C) | 
| A. | 9.1 × 10-31 kg | 
| B. | 1.6 × 10-27 kg | 
| C. | 1.6 × 10-19 kg | 
| D. | 2.0 × 10-24 kg | 
| Answer» E. | |