1
BITSAT 2022
MCQ (Single Correct Answer)
+3
-1

An electric current I enters and leaves a uniform circular wire of radius r through diametrically opposite points. A charged particle q moves along the axis of circular wire passes through its centre at speed v. The magnetic force on the particle when it passes through the centre has a magnitude.

A
$${{qv{\mu _0}I} \over {2\pi r}}$$
B
$$qv{{{\mu _0}I} \over {\pi r}}$$
C
$${{qv{\mu _0}I} \over r}$$
D
0
2
BITSAT 2022
MCQ (Single Correct Answer)
+3
-1

An achromatic convergent doublet of two lenses in contact has a power of +5 D. The power of converging lens is +6 D. The ratio of the dispersive power of the convergent and divergent lenses is

A
3 : 7
B
2 : 3
C
1 : 5
D
5 : 3
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