physics ncert exemplar solution class 12th chapter one

As the switch S is closed in the circuit shown in figure, current passed through it is

The power of a heating coil is P. It is cut into two equal parts. The power of one of them across same mains is

Before connecting the circuit shown in figure all capacitors were uncharged. The circuit now is in steady state. Now the switch $S$  is closed. During the time the steady state is reached again:

Column?I	Column?II
i. Charge on C1	p. increases
ii. Charge on C2	q. decreases
iii. Charge on C3	r. remains same
iv. Charge on C4	s. becomes zero

Now, match the given columns and select the correct option from the codes given below.

Codes:

A $10\Omega$ 20 mH coil carrying constant current is connected to a battery of 20 V through a switch. Now after switch is opened current becomes zero in 100 $\mu s.$The average e.m.f. induced in the coil is__________V.

In free space, an electromagnetic wave of 3 GHz frequency strikes over the edge of an object of size $\frac{\lambda }{100},$ where $\lambda$ is the wavelength of the wave in free space. The phenomenon, which happens there will be

Three point charges of magnitude $5\mu C,0.16\mu C,and0.3\mu C$ are located at the vertices A, B, C of a right angled triangle whose sides are AB = 3cm, BC = $3\sqrt[]{2}$ and CA = 3 and point A is the right angle corner. Charge at point A experiences __________ N of electrostatic force due to the other two charges.

Given below are two statements:

Statement I : An electric dipole is placed at the centre of a hollow sphere. The flux of electric field through the sphere is zero but the electric field is not zero anywhere in the sphere.

Statement II : If R is the radius of a solid metallic sphere and Q be the total charge on it. The electric field at any point on the spherical surface of radius r (

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

An inclined plane making an angle of 30° with the horizontal is placed in a uniform horizontal electric field $200\frac{N}{C}$ as shown in the figure. A body of mass 1kg and charge 5 mC is allowed to slide down from rest at a height of 1m. If the coefficient of friction is 0.2, find the time taken by the body to reach the bottom.

$\left[g=9.8m/s^2;sin30°=\frac{1}{2};cos30°=\frac{\sqrt[]{3}}{2}\right]$

Two charged thin infinite plane sheets of uniform surface charge density ${\sigma }_{+}$ and ${\sigma }_{-}$ , where $\left|{\sigma }_{+}\right|>\left|{\sigma }_{-}\right|$ , intersect at right angle. Which of the following best represents the electric field lines for this system.

A uniform electric field E = (8m/e) V/m is created between two parallel plate of length 1m as shown in figure, (where m = mass of electron and e = charge of electron). An electron enters the field symmetrically between the plates with a speed of 2 m/s. The angle of the deviation ( θ) of the path of the electron as it comes out of the field will be________.