Physics NCERT Exemplar Solutions Class 11th Chapter Eight

Two springs with spring constants  $k_1=1200N/m$ and $k_2=500N/m$  are stretched by the same force. The ratio of potential energy in the springs will be

In the diagram shown below, the block has charge  $Q$ and is attached at one end of the light spring. The surface is smooth and horizontal and spring is in its natural length. If the electric field $E$ is switched on, the maximum elongation in the spring will be

In a region of space, the electric field is given by $\vec{E}=6\widehat{i}-4\widehat{j}+7\widehat{k}$ . Electric flux through a surface of area  $200$ unit in $y-z$  plane will be

A uniform wire of resistance  $20\mathrm{\Omega }$ having resistance $1\mathrm{\Omega }/m$ is bent in the form of a circle as shown in figure. If the equivalent resistance between $A$ and $B$ is $1.8\mathrm{\Omega }$ , then length of the shorter section is

In an experiment to verigy Newton's law of cooling, a graph is plotted between, the temperature difference $\left(\Delta T\right)$ of the water and surrounding and time as shown in figure. The initial temperature of water is taken as $80°C.$  The value of t₂ as mentioned in the graph will be _______.

A monoatomic gas performs a work of $\frac{Q}{4}$  where Q is the heat supplied to it. The molar heat capacity of the gas will be ________ R during this transformation. Where R is the gas constant.

A circular coil of 1000 turns each with area 1m² is rotated about its vertical diameter at the rate of one revolution per second in a uniform horizontal magnetic field of 0.07 T. The maximum voltage generation will be ________V.

A ray of light is incident at an angle of incidence $60°$ on the glass slab of refractive index $\sqrt[]{3}.$ After refraction, the light ray emerges out from other parallel faces and lateral shift between incident ray and emergent ray is $4\sqrt[]{3}$  cm. The thickness of the glass slab is _______cm.

A wire carrying a current I along the positive $x$ -axis has length $L$ It is kept in a magnetic field $\vec{B}=(2\hat{i}+3\hat{j}-4\hat{k})$  T. The magnitude of the magnetic force acting on the wire is:

A very long conducting wire is bent in a semi-circular shape from $\mathrm{A}$ to $\mathrm{B}$ as shown in figure. The magnetic field at point $\mathrm{P}$  for steady current configuration is given by: