Physics

A source of frequency $\text{'}X\text{'}$ gives 5 beats/s when sounded with a source of frequency $95Hz$ . The third harmonic of source $\left(X\right)$ gives 10 beats/s when sound with a source of frequency $290Hz$ . The value of $X$ is

A rectangular coil of wire of $500$ turns of area $10*5c{m}^2$ carries a current of $2A$ in a magnetic field of induction $2*{10}^{-3}T$ . If the plane of the coil is parallel to the field. The torque on the coil is $\left(inNm\right)$  

An object of height 1.5cm is placed on the axis of a convex lens of focal length 25cm. A real image is formed at a distance of 75cm from the lens. The size of the image will be

The superposition of waves can result in

The correct expression in accordance with Gauss's law for magnetism is

Which of the following combination of properties would be desirable for handling a cooking pan?

The temperature of the black body as calculated from the graph is (Wien's constant = $2.89*{10}^{-3}$ )

A circular beam of light of diameter d=2cm falls on a plane surface of glass. The angle of incidence is 60⁰ and refractive index of glass is $\mu =3/2$ . The diameter of the refracted beam is:

A capacitor is of capacity $C$ and reactance $X$ . If capacitance and frequency become triple then reactance will be

If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is