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A wire carrying current I and other carrying 2I in the same direction produces a magnetic field B at the midpoint. What will be the field when 2I wire is switched off?
(a) B/2
(B) 2B
© B
(D) 4B -
If error in measurement of radius of sphere is 1%, what will be the error in measurement of volume?
(a) 1%
(B) 1/3%
© 3%
(D) 10% -
Minimum numbers of unequal vectors which can give zero resultant are
(a) Two
(B) Three
© Four
(D) More than four -
A large ship can float but a steel needle sinks because of
(a) Viscosity
(B) Surface tension
© Density
(D) None of these -
In a solenoid, if number of turns is doubled, then self-inductance will become
(a) Half
(B) Doubled
© 1/4Times
(D) Quadruped