Physics

What is resonance in forced oscillations?

What is meant by the phase of SHM?

What is the restoring force in Simple Harmonic Motion?

An unpolarised light beam strikes a glass surface at Brewster's angle. Then

In a uniform magnetic field of 0.049 T, a magnetic needle performs 20 complete oscillations in 5 seconds as shown. The moment of inertia of the needle is $9.8*10^{-6} kg m^2$ . If the magnitude of magnetic moment of the needle is $x*10^{-5}A{m}^2$ , then the value of ' $x$  ' is :

Two bodies $A$ and $B$ of same mass undergo completely inelastic one dimensional collision. The body $A$ moves with velocity $v_1$ while body $B$ is at rest before collision. The velocity of the system after collision is $v_2$ . The ratio $v_1:v_2$  is

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: The potential ( $V$ ) at any axial point, at 2 m distance ( $r$ ) from the centre of the dipole of dipole moment vector $\dot{P}$ of magnitude, $4*10^{-6}Cm$ , is $\pm 9*10^3 V$ .

(Take $\frac{1}{4\pi {ϵ}_0}=9*10^9$ SI units)

Reason R :  $V=\pm \frac{2P}{4\pi {?}_0{r}^2}$ , where $r$  is the distance of any axial point, situated at 2 m from the centre of the dipole.

In the light of the above statements, choose the correct answer from the options given below:

At any instant of time $t$ , the displacement of any particle is given by $2t-1$  (SI unit) under the influence of force of 5 N. The value of instantaneous power is (in SI unit):

In the following circuit, the equivalent capacitance between terminal $A$ and terminal $B$  is :

A wheel of a bullock cart is rolling on a level road as shown in the figure below. If its linear speed is $v$ in the direction shown, which one of the following options is correct ( $P$ and $Q$  are any highest and lowest points on the wheel, respectively)?