Physics Test - 5

What is increased in a step-down transformer

A conductor rod of length L rotates with angular speed ω in a uniform magnetic field of induction B which is perpendicular to its motion. The induced e.m.f developed between the two ends of the rod is

The induced e.m.f. produced in the primary and secondary coils is 2 mV and 5 mV respectively. If the rate of change of current is 20 A-s^-1, then coefficient of mutual induction of the secondary coil is

Which of the following rays are not electromagnetic wave?

A sphere S₁ of radius r₁ encloses a total charge Q. If there is another concentric sphere S₁ of radius r₂ > r₁ and there be no additional charges between S₁ and S₂, the ratio of electric flux through S₁ and S₂ is

An electron of charge e coulomb passes through a potential difference of V volt. Its energy in joule will be

An electric dipole consists of two opposite charges of magnitude +- q seperated by 2a. When the dipole is placed in uniform electric field E, to have minimum potential energy, then dipole moment p makes which the following angle with E

The capacitance of a parallel plate capacitor is 10 μF when distance between its plates is 8 cm. If distance between the plates is reduced to 4 cm, its capacitance will be

A cyclotron can not accelerate

The difference between the mass of a nucleus and the total mass of the constituents is its