# Exams - PAT

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A parallel plate capacitor contains one mica sheet of thickness d1=1.0X10-3m and one fibre sheet of thickness d2=.5X10-3. The dielectric constants of mica and fibre are 8 and 2.5 respectively . Fibre break down in an electric field of 6.4X106 V/m .What maximum voltage can be applied to the capacitor?

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A circular ring of Radius a with uniform positive charge density  per unit length is located in the Y-Z plane with its center at the origin O. A particle of mass M0 and positive charge Q0 is projected from the point S (av3,0,0) on the positive X axis directly towards O with initial speed v0. Find the smallest (non zero) value of the speed v0 such that the particle does not return to point S?

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The radius of the Bohr's first orbit is a0. what will be the angular momentum of the electron in the nth orbit ?

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An circular coil of radius R consists of N turns of wire.The current in the wire is I.Let B is the magnetic field at the center of the coil Which of the following is true?

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A train sounds its whistle as it approaches and leaves a station.An man at the station measures a frequency of 200 Hz as the train approaches and a frequency of 180 Kz as the train leave.Find the speed of the train. Speed of the sound is given as 340 m/s?

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