For uniform electric field, field lines are _______
Uniform electric field is represented by parallel and equally spaced filed lines. Uniform electric field The region around the electric... View Article
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Electric flux of a surface is maximum, when
The electric flux of a surface is maximum when the area vector is parallel to the direction of the electric field.... View Article
A material in which electrons are tightly bound and cannot move freely at room temperature is called
Insulators are those materials in which electron are tightly bound and cannot move freely at room temperature.
Acceleration (a) of a body of radius R rolling down an inclined plane of inclination θ is given by
Acceleration (a) of a body of radius R rolling down an inclined plane of inclination θ is given by a = g... View Article
A solid sphere is made to roll down two inclined planes with same height but different lengths then:
Since the height is the same, the speed at the bottom will be the same. Therefore, the correct option is... View Article
A body is rolling down an inclined plane without slipping. How does the acceleration of the rolling body depend on its radius?
The acceleration of the rolling body is independent of its radius
The kinetic energy of a rolling wheel is
Rolling wheel’s K.E will comprise of both translational K.E. and Rotational K.E.
A proton and an electron, initially at rest, are allowed to move under their mutal attractive force. Their centre of mass will:
We require an external force to move the centre of mass of a system of particles. The mutual force of... View Article
Two balls are thrown simultaneously in air. The acceleration of the centre of mass of the two balls, while in air
The only force acting on the balls is the force of gravity, so the acceleration of the centre of mass... View Article
A shell following a parabolic path explodes somewhere in its flight. The centre of mass of fragments will continue to move in (a) Vertical direction (b) Same parabolic path (c) Horizontal direction (d) Any direction.
Option (b) – Same parabolic path The internal forces do not affect the trajectory of the centre of mass, and the... View Article
Which of the following is not a binary system?
A binary system is one in which two bodies revolve about a common centre of mass. In earth-moon-sun system, center... View Article
Which of the following is the unit of angular acceleration?
The unit of angular acceleration is rad / s 2.
Which of the following statements give the relationship between linear velocity and angular velocity correctly?
Angular velocity (ω) = Linear velocity (v)/ radius (r).
A coil is wound as a transformer of rectangular cross-section. If all the linear dimensions of the transformer are increased by a factor 2 and the number of turns per unit length of the coil remain the same, the self inductance increased by a factor of
Self inductance L= μ0 N2 A / l = μ0 n2 lA Where n is the... View Article
A man standing on a table rotating about the central axis pulls his hands holding the dumb bells towards chest. How the angular velocity will change?
When the man pulls his hands towards chest, the moment of inertia will decrease and due to conservation of angular... View Article
The centre of mass of the sun, earth, and moon system lies
The mass of the sun is very large as compared to that of earth and moon, therefore the centre of... View Article
The external force for the earth moon system is due to
The gravitational attraction between earth and moon is the internal force to earth moon system, whereas attraction of the sun on... View Article
A stone of mass m tied to a string of length l is rotating along a circular path with constant speed v. The torque on the stone is
Because the angular acceleration is zero and hence the torque is zero.
A wheel with ten metallic spokes each 0.50 m long is rotated with a speed of 120 rev/min in a plane normal to the earth’s magnetic field at the place. If the magnitude of the field is 0.4 Gauss, the induced e.m.f. between the axle and the rim of the wheel is equal to
e = Bl2 πv = 0.4 X 10-4 X (0.5)2 X (3.14) X 120 / 60 = 6.28 X 10-5... View Article
A negative ion is an atom that ________ electrons
a negative ion is an atom that has gained one or more electrons.
