- Show mathematically that potential at a point on the equatorial line of an electric dipole is zero
- A storage battery of emf 12 V and internal resistance 0.5 Ω is to be charged by a 120 V d.c. supply of negligible internal resistance. What resistance is required in the circuit for the charging current to be 3 A ? What is the terminal voltage of the battery during charging?
- Using Ampere circuital law derive an expression for the magnetic field along the axis of a torodial solenoid
- Derive the expression for the self-inductance of a solenoid.
- In a given circuit inductor L and resister R have identical resistance. Two similar electric lamps B1and B2are connected as shown. When switch S is closed,
- which one of the lamps lights up earlier
- will the lamps be equally bright after some time? Justify your answer.
- Define one coulomb of charge.
- The small ozone layer on the top of the stratosphere is crucial for human survival, why?
- Why can’t a transformer be used to step up dc voltage?
- What is the nature of the magnetic field in a moving coil galvanometer?
- The current is set up in a long copper pipe. Is there a magnetic field
- inside
- outside the pipe?
- Sketch three equipotential surfaces for a pt. charge.
- How is the coulomb force between two charges affected by the presence of the third charge?
- What is the cause of induced emf?
- Why are microwaves used in RADAR?
- A uniform magnetic field gets modified as shown below, When two specimens X and Y are placed in it.
dentify the two specimens X and Y
- State the reason for the behaviour of the field lines in X and Y.
- Give any one difference between FAX and e-mail systems of communication.
- Give the ratio of the number of holes and number of conduction electrons in an intrinsic semiconductor.
- How does focal length of a lens change when red light is replaced by blue light?
- How does the intensity of central maximum change, if the width of the slit is halved in a single slit diffraction experiment?
- How will the photoelectric current change on decreasing the wavelength of incident radiation for a given photosensitive material?
- In which series of hydrogen spectra, the transitions involve the longest changes energy?
- What is the mass of pion plus (p+)?
- Vehicles moving in foggy weather use yellow colour head-lights. Why?
- Name the physical quantity whose S.I. unit is :
- Coulomb Per Volt
- Volt/ meter.
