A transmitting station transmits radiowaves of wavelength 360 m. Calculate the inductance of coil required with a condenser of capacity 1.20 μF in the resonant circuit to receive them
A capacitor of capacitance 2μF is connected in the tank circuit of an oscillator oscillating with a frequency of 1 kHz. If the current flowing in the circuit is 2 mA, the voltage across the capacitor will be
The core used in transformer and other electromagnetic instruments is laminated, the reason is
to increase the electric field
to increase the magnetic field
to reduce the loss of energy due to eddy currents
to decrease the resistance
If in a circuit current lags behind EMF by . Then it is a/an
The peak value of alternating current is ampere. The mean square value of current will be
None of the above
An AC supply gives 30Vrms which is fed on a pure resistance of 10 ohm. the power dissipated in this is
Assertion: The quantity L/R possesses dimension of time.
Reason: To reduce the rate of increase of current through a solenoid, we should increase the time constant ( L/R ).
If both the assertion and reason are true and reason is a correct explanation of assertion
If both assertion and reason are true but assertion is not correct explanation of the assertion
If the assertion is true but the reason is false.
If both assertion and reason are false.
A capacitor when charged by a potential difference of 200 volt, stores a charge of 0.1 C. By discharging, energy liberated by the capacitor is
If an ideal parallel LC circuit, the capacitor is changed by connecting it to a d.c source which is then disconnected. The current in the circuit
becomes zero instantaneously
A coil having resistance of 50 ohm and an inductance of 10 ohm, is connected to a 100 volt battery. The energy stored in the coil is