A) the charge is positive and slowing down
B) the charge is negative and slowing down
C) the charge is positive and speeding up
D) the charge is negative and speeding up
Correct Answer: A
Solution :
[a] \[R=\frac{mv}{qB}\]; \[\overset{\to }{\mathop{F}}\,=q(\overset{\to }{\mathop{v}}\,\times \overset{\to }{\mathop{B}}\,)\] As R decreases, v will decrease. Clockwise motion for upward magnetic field\[\to +ve\]
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