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QAIPM-2011-Ph-1813: NEET 2011 Physics - Class 12 AIPM-2011-Ph-1813 Solution: A small mass attached to a string rotates on a frictionless…
A small mass attached to a string rotates on a frictionless table top as shown. If the tension in the string is increased by pulling the string causing the radius of the circular motion to decrease by a factor of 2 the kinetic energy of the mass will decrease by a factor of 2 remain constant increase by a factor of 2 increase by a factor of 4
Multiple Choice Options
- A 8 along negative X-axis
- B 8 along positive X-axis
- C 16 along negative X-axis
- D 16 along positive X-axis
Step-by-Step Verified Solution
E _ = _ _ _ V
where _ _ = i ^ � � x + j ^ � � y + � � z
E _ = _ [ i ^ � V � x + j ^ � V � y + k ^ � V � z ]
Here, V = 4x 2
_ E _ = _ 8 x i ^
The electric field at point (1, 0, 2) is
E _ ( 1 , 0 , 2 ) = _ 8 i ^ V m _ 1
So electric field is along the negative X-axis.