A small object is 10 cm in front of a plane mirror. A man stands 30 cm from the mirror behind the object and looks at the object's image. He should focus his eyes to see the image at a distance
Two copper spheres, A and B, are identical in all respect but A carries a charge of \[-3\mu C\] whereas B is charged to \[+1\mu C\] The two spheres are brought together until they touch and then separated by some distance. Which of the following statements is true concerning the electrostatic force F between the spheres?
A bucket of total height 60 cm is half filled with a liquid of refractive index 1.5 and half with another liquid of refractive index 2. The apparent depth of the bucket for an observer directly above the bucket is
A soap bubble has a thickness of 100 nm and a refractive index of 1.35. Given that the wavelength of red light is about 700 nm and that of blue light is 400 nm, what colour does the bubble appear to be at the point on its surface closest to an observer when it is illuminated by white light?
The wavelength of radiation emitted is\[{{\lambda }_{0}}\], when an electron jumps from the third to the second orbit of hydrogen atom. For the electron jump from the fourth to the second orbit of the hydrogen atom, the wavelength of radiation emitted will be
A uniform electric field and a uniform magnetic field are produced, and are pointed in the same direction. An electron is projected with its velocity pointed in the same direction
An electron emitted from a hot filament is accelerated through a potential difference of 2.88 kV and enters a region of a uniform magnetic field \[0.\pi \]at an angle of \[{{30}^{o}}\] with the field. Take the mass of an electron \[9\times {{10}^{-31}}\] kg. The trajectory of the electron is
The coefficient of friction between two blocks of masses 1 kg and 4 kg as shown in figure is ]i and the horizontal plane is smooth. If the system is slightly displaced and released it will execute S.H.M. The maximum amplitude if the upper block does not slip relative to lower block will be (k is spring constant)
Statement 1: An inductance and a resistance are connected in series with an ac circuit. In this circuit the current and the potential difference across the resistance lags behind potential difference across the inductance by an angle of \[\pi /2\].
Statement 2: In a LR circuit voltage leads the current by phase angle which depends on the value of inductance and resistance both.
A)
Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
doneclear
B)
Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.