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Two students hold a long wire and rotate it across the earth’s

Two students hold a long wire and rotate it
across the earth’s magnetic field so that the wire traces a circular path of
radius 1.2 m. The motional emf produced
in the rope is then measured on a voltmeter. If the angular frequency of
rotation is w = 12 rad.s-1, calculate the maximum possible motional emf in the
wire. (Use B = 0.3 G = 0.3×10-4 T for the Earth’s magnetic field.)


Heat transfer occurs between two bodies in
thermal contact when they differ in


Which of the following best describes a
substance whose temperature remains constant while at the same time it is
experiencing an inward heat flow?

gas under constant volume
substance undergoing phase change.

What happens to an amount of water when its
temperature is reduced from 8°C to 4°C?

density increses
density decreases
density remains a constant

A ray of light strikes a mirror at an angle
of 53° to the mirror’s surface. What is the angle of incidence with respect to
the normal drawn to the surface of the mirror?


A ray of light in air strikes a glass
surface at an angle of incidence of 30°. Calculate the angle of refraction.
(Use nair = 1.0 and nglass = 1.5.)


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