A solenoid has an inductance of 50 mH and a resistance of 0.025 Ω . If it is connected to a battery, how long will it take for the current to reach one half of its final equilibrium value?

Questions from NTA Abhyas 2022

1. Which one of the following statements is wrong in the context of -rays generated from an -ray tube?

2. Light of two different frequencies whose photons have energies and respectively illuminate a metallic surface whose work function successively. The ratio of maximum speeds of emitted electrons will be

3. A thin semicircular conducting ring of the radius is falling with its plane vertical in a horizontal magnetic induction . At the position MNQ, the speed of the ring is and the potential difference developed across the ring is

4. A flat mirror is arranged parallel to the wall at a distance from it. The light produced by a point source kept on the wall is reflected by the mirror and produces a light spot on the wall. The mirror moves with velocity towards the wall.

5. A particle moves along axis as , here is a constant. Which of the following is true?

Physics Most Viewed Questions

1. A car starts from rest and accelerates at At , a ball is dropped out of a window by a person sitting in the car. What is the velocity and acceleration of the ball at ? (Take

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2. If and respectively denote energy and gravitational constant, then has the dimensions of:

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3. The de Broglie wavelength of an electron moving with kinetic energy of is nearly

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4. A wheel with metallic spokes each long is rotated with a speed of in a plane perpendicular to a magnetic field of . The induced emf between the axle and rim of the wheel will be,

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5. Calculate the acceleration of the block and trolly system shown in the figure The coefficient of kinetic friction between the trolly and the surface is , mass of the string is negligible and no other friction exists

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