Physics Test - ...

A box of mass m kg is placed on the rear side of an open truck accelerating at 4 ms^-2. The coefficient of friction between the box and the surface below it is 0.4. Then the net acceleration of the box with respect to the truck is zero. The value of m is [Given g = 10 m s^-2]

The current from A to B is increasing in magnitude. What is the direction of induced current, if any, in the loop shown in figure.

The alternating current I in an inductance coil varies with time according to graph given in figure.

Which one of the following graphs, gives the variation of voltage with time?

In a Rutherford scattering  experiment, when a projectile of charge z₁ and mass M₁ approaches a target nucleus of charge z₂ and mass M₂, the distance of closest approach is r₀. The energy of the projectile is

A block of mass m & charge q is released on a long smooth inclined plane. Magnetic field B is constant, uniform, horizontal and out of the plane of paper as shown. Find the time from start when block loose contact with the surface.

An electrically charged particle enters into a uniform magnetic induction field in a direction perpendicular to the field with a velocity v. Then, it travels

In series LCR, RMS voltage drop across them are 40 V, 40 V, 40 V. The peak value of applied ac voltage is

Which of the following is incorrect regarding Rutherford's atomic model?

What is the largest charge a metal ball of 1 mm radius can hold? Dielectric strength of air is 3 × 10⁶ Vm^-1.

A particle is given an initial speed u inside a smooth spherical shell of radius R = 1 m that it is just able to complete the circle. Acceleration of the particle when its velocity is vertical is-