A spherical conductor of radius 3 m is charged to a potential of 90 V. It is now placed inside another hollow spherical conductor of radius 6 m. Calculate the potential of bigger sphere if the smaller sphere is made to touch the bigger sphere?

Anonymous User Physics 25 Mar, 2019 1 Answer 568 views

A bag contains 50 tickets, numbered from 1 to 50. One ticket is drawn at random. What is the probability that

(i) number on the ticket is a perfect square or divisible by 3 ?

(ii) number on the ticket is prime number or greater than 40 ?

Anonymous User Maths Probability and statistics 25 Mar, 2019 1 Answer 91 views

A mass (M) is split into two parts (m) and (M–m). Which are then separated by a certain distance. What ratio m M will maximise the gravitational force between the parts ?A mass (M) is split into two parts (m) and (M–m). Which are then separated by a certain distance. What ratio m/ M will maximise the gravitational force between the parts ?

Anonymous User Physics 16 Mar, 2019 1 Answer 141 views

Two stationary particles of masses M1 and M2 are at a distance 'd' apart. A third particle lying on the line joining the particles, experiences no resultant gravitational forces. What is the distance of this particle from M1 ?

Anonymous User Physics 15 Mar, 2019 1 Answer 985 views

A problem in statistics is given to three students A, B and C. Their chances of solving the problem are 1/3, 1/4 and 1/5 respectively. If all of them try independently, what is the probability that?

  1. (i)  problem is not solved ?
  2. (ii)  problem is solved ?
  3. (iii)  exactly two students solve the problems

Anonymous User Maths 09 Mar, 2019 0 Answer 122 views

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EmilyGeorge General Science 20 Feb, 2019 0 Answer 84 views

An electrical cable of copper has just one wire of radius 9 mm. Its resistance is 5 ohm. This single copper wire of the cable is replaced by 6 different well insulated copper wires each of radius 3 mm. The total resistance of the cable will now be equal to?

Anonymous User Physics 04 Feb, 2019 1 Answer 139 views

A short bar magnet with its north pole facing north forms a neutral point at P in the horizonatal plane. If the magnet is rotated by 90° in the horizontal plane, the net magnetic induction at P is (Horizontal component of earth's magnetic field = BH )

Ashish Yadav Physics 04 Feb, 2019 1 Answer 1810 views

A thermally insulated vessel contains an ideal gas of molecular mass M and ratio of specific heats g. It is moving with speed v and it's suddenly brought to rest. Assuming no heat is lost to the surroundings, its temperature increases by:

Anonymous User Physics 01 Feb, 2019 1 Answer 313 views

A particle performs S.H.M. of amplitude A along a straight line. At two positions of the particle, the ratio of speeds is 1/2 and that of potential energy is 1/2 also. Then one position of them (distance from mean position) nearest to the extreme is :

Anonymous User Physics 01 Feb, 2019 0 Answer 131 views

A particle is projected from ground with an initial velocity 20 m/sec making an angle 60° with horizontal. If R1 and R2 are radius of curvatures of the particle at point of projection and highest point respectively,find the value of R1/R2?

Devendra Yadav Physics 18 Jan, 2019 1 Answer 92 views

The bob of a simple pendulum is a spherical hollow ball filled with water. A plugged hole near the bottom of the oscillating bob gets suddenly unplugged. During observation, till water is coming out, the time period of oscillation would?

Anonymous User Physics 15 Jan, 2019 1 Answer 69 views

A coin is placed on a horizontal platform which undergoes vertical simple harmonic motion of angular frequency w. The amplitude of oscillation is gradually increased. The coin will leave contact with the platform for the first time

Anonymous User Physics 15 Jan, 2019 1 Answer 189 views

Two protons of equal kinetic energies enter a region of uniform magnetic field. The
first proton enters normal to the field direction while the second enters at 30 degree to the field direction. Name the trajectories followed by them.

Naveen Singh Physics 03 Jan, 2019 1 Answer 1385 views