7- A charge particle moving in a magnetic field it -i - j-T- experiences a magnetic force -2- - aj- N some instant- Then the value of a is -1- -2 -2- 2- F- q -Vx3- -3- 3 -4- -3 2 -J-

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7. A charge particle moving in a magnetic field it (i + j)T, experiences a magnetic force (2ỉ - aj) N at some instant. Then the value of a is (1) -2 (2) 2. F= q (Vx3) (3) 3 (4) -3 2 *J?

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