Physics-
General
Easy
Question
A wire shown in figure carries a current of 40 A. If 
, the magnetic field at point 
will be
The correct answer is:
Let the given circular 
part of wire subtends an angle 
at its centre. Then, magnetic field due to this circular part is
Given, 
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and 
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physics-General
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The figure shows the cross-section of a long cylindrical conductor of radius 
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The magnetic field due to current at is
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Which of the following compounds is resistant to nucleophilic attack by hydroxyl ions?
Which of the following compounds is resistant to nucleophilic attack by hydroxyl ions?
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The boiling point of ethyl alcohol is much higher than that of dimethyl ether and 
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Two identical bar magnets are fixed with their centres at a distance d apart. A stationary charge 
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from the centre 
as shown in the figure 
The force on the charge is
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Consider a disc rotating in the horizontal plane with a constant angular speed w about its centre O. The disc has a shaded region on one side of the diameter and an unshaded region on the other side as shown in the figure. When the disc is in the orientation as shown, two pebbles P and Q are simultaneously projected at an angle towards R. The velocity of projection is in the y-z plane and is same for both pebbles with respect to the disc. Assume that (i) they land back on the disc before the disc has completed 1/8 rotation, (ii) their range is less than half the disc radius, and (iii) w remains constant throughout. Then
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A ball of mass (m) 0.5 kg is attached to the end of a string having length (L) 0.5 m. The ball is rotated on a horizontal circular path about vertical axis. The maximum tension that the string can bear is 324 N. The maximum possible value of angular velocity of ball (in radian/s) is
A ball of mass (m) 0.5 kg is attached to the end of a string having length (L) 0.5 m. The ball is rotated on a horizontal circular path about vertical axis. The maximum tension that the string can bear is 324 N. The maximum possible value of angular velocity of ball (in radian/s) is
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A bob of mass M is suspended by a massless string of length L. The horizontal velocity v at position A is just sufficient to make it reach the point B. The angle at which the speed of the bob is half of that A, is
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If 
, 
and 
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physics-General
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Newton/meter2 is the unit of
Newton/meter2 is the unit of
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What is the SI unit of permeability
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3-methyl-2-butanol on treatment with 
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E m I and G denote energy, mass, angular momentum and gravitational constant respectively, then the dimensions of 
are
E m I and G denote energy, mass, angular momentum and gravitational constant respectively, then the dimensions of are
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The block of mass M moving on the frictionless horizontal surface collides with the spring of spring constant k and compresses it by length L. The maximum momentum of the block after collision is
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A vertical frictionless semicircular track of radius R is fixed on the edge ofmovable trolley. Initially the system is at rest and a mass m is kept at the top of the track. The trolley starts moving to the right with a uniform horizontal acceleration 
. The mass slides down the track, eventually losing contact with it and dropping to the floor h below the trolley The time taken by the mass to drop on the floor, after losing contact is
A vertical frictionless semicircular track of radius R is fixed on the edge ofmovable trolley. Initially the system is at rest and a mass m is kept at the top of the track. The trolley starts moving to the right with a uniform horizontal acceleration . The mass slides down the track, eventually losing contact with it and dropping to the floor h below the trolley The time taken by the mass to drop on the floor, after losing contact is
physics-General
