A circuit area 0.01 m² is kept inside a magnetic field which is normal to its plane. The magnetic field changes from 2 tesla to 1 tesla in 1 milli second. If the resistance of […]
A bar magnet of moment M and pole strength m is cut into parts of equal lengths. The magnetic moment and pole strength of either part is
Options
(a) M/2, m/2 (b) M, […]
A pellet of mass 1 g is moving with an angular velocity of 1 rad/s along a circle of radius 1 m the centrifugal force is
Options
(a) 0.1 dyne (b) 1 dyne […]
A roller coaster is designed such that riders experience “weightlessness” as they go round the top of a hill whose radius of curvature is 20 m. The speed of the car at the top of […]
Suppose for some reasons, radius of earth were to shrink by 1% of present value, mass remaining same, then g(acceleration due to gravity), will change by
Options
(a) Nil (b) 1% (c) -1% […]
In some region, gravitational field is zero. The gravitational potential in this region
Options
(a) Must be variable (b) Must be constant (c) Cannot be zero (d) Must be zero
Correct Answer:
Must […]
A capacitor of capacitance 100μF is charged by connecting it to a battery of voltage 12V with internal resistance 2Ω. The time after which 99% of the maximum charge is stored on the capacitor is […]
A Gaussian surface in the cylinder of cross-section πa² and length L is immersed in a uniform electric field E with the cylinder axis parallel to the field.The flux ? of the electric field through […]
In N-type semi-conductor current is due to
Options
(a) Electrons (b) Holes (c) Electrons and holes (d) None of these
Correct Answer:
Electrons
Explanation:
No explanation available. Be the first to write the […]
An LED is constructed from a p-n junction based on a certain semi-conducting material whose energy gap is 1.9 eV. Then, the wavelength of the emitted light is
Options
(a) 6.5×10⁻⁷ m (b) […]
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