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Mdcat-past-papers - DUHS Quiz

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121. If 2μF and 4μF capacitors are connected in series. Their equivalent capacitance will be:



122. If a slab of dielectric constant εr = 2 is inserted between the parallel plates of a charged 20μF capacitor. Its capacitance will:



123. Two capacitors 6μF and 12μF are in series connected across a 200 volts D.C supply. Calculate the charges on each capacitor, respectively.



124. The path of a neutron moving perpendicular to magnetic field is:



125. A charged particle of mass "m" and charge "q" is projected in a magnetic field of induction B at an angle θ. The radius of curvature of its curved path is given by:



126. Which of the following defines the change in magnetic flux per unit area?



127. What is the dot product of magnetic induction and unit area?



128. What does the magnetic flux measure in?



129. When magnetic field and vector area are perpendicular then magnetic flux will be:



130. 1 eV is equal to:



131. A proton of charge 1.6 × 10⁻¹⁹ C is moved through a potential difference of 20 V. The energy gained by the proton is:



132. A magnetic field exerts a force on a charged particle:



133. A coil of 600 turns is threaded by magnetic flux of 8 webers. If this flux is reduced to 5 webers in 3 seconds. The induced EMF in the coil will be:



134. The mathematical equation representing Faraday's law is:



135. For efficient transfer of electricity through cables over the long distance:



136. Lenz' law is a form of the:



137. On which principle does the transformer work?



138. If a transformer has 500 turns on primary coil and 250 turns on secondary coil, then:



139. Induced EMF in A.C. generator can be increased by:



140. The main function of a transformer is to convert:



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