VITEEE 2017 :: Physics :: General questions

• Physics - General questions

Which of the following is a self adjusting force?

Answer:

Explanation:

Static friction is a self adjusting force in magnitude and direction

An A.C. source is connected to a resistive circuit. Which of the following is true?

Answer:

Explanation:

When resistance is connected to A.C source, then-current & voltage are in the same phase.

An electron makes a transition from an excited state to the ground state of a hydrogen-like atom. Then

Answer:

Explanation:

$U = -K \frac{ze^{2}}{r}; T.E = \frac{-k}{2}\frac{ze^{2}}{r}$

$K.E = \frac{k}{2}\frac{ze^{2}}{r}$, Here r decreases.

The value of tan(90°- θ) in the graph gives

Answer:

Explanation:

$\tan\left(90^{\circ}-\theta\right) = \frac{stress}{strain}$

A current-carrying coil is subjected to a uniform magnetic field. The coil will orient so that its plane becomes

Answer:

Explanation:

A current-carrying coil behaves as a magnetic dipole. Therefore, in a uniform magnetic field coil will get aligned such that the dipole moment of the coil is parallel to the magnetic field. And we know that the dipole moment of a coil is perpendicular to its plane.

Therefore, coil will align itself such that its plane is perpendicular to the direction of the magnetic field.

• Physics - General questions