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Question

Gravitational field in a region is given by vector (4^i+^j). Work done by this field is zero when particle is moved along line


A
y+4x=2
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B
4y+x=6
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C
x+y=4
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D
xy=4
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Solution

The correct option is B y+4x=2
Slope of field is 14.
For the work to be zero, the dispalcement should be perpendicular to the field. Therfore, the slope of the line should be 4. Equation in option (1) has slope 4.

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