15 Dec. 2021 Daily Current Affairs Show #05 | Current GK Today ( in Hindi )| by GAURAV Sir | Doubtnut

Daily Current Affairs 11 Feb 2020 | SSC-CGL, RBI, NDA, SBI, IBPS, Railways, UPSC

A step down transformer is used at 220 V to provide a current of 0.5 A to a 15 W bulb. If the secondary has 20 turns, find the number of turns in primary coil has current that flows in primary coil.

An inductor of inductance L Henry is connected to an AC supply of 12 V . The frequency of source is 50 Hz and current in the inductor is 0.5 A. When the same inductor is connected across a direct current supply of 12 V it draws the current of 1.5 A . Find the value of L .

In toroid magnetic field magnetic field on axis will be radius = 0.5 cm, current = 1.5 A, turns = 250, permeability = 700

A current of 0.5 A is passed through a coil of 200 turns and radius 10 cm. Another currwent carrying coil of 250 turns and radius 15 cm is kept concentric with the first and in the same plane. What is the current through the second coil if the net magnetic induction at teh centre of the coils is zero ?

When a current of 0.5 A is passed through two resistance in series, the potential difference between the ends of the series arrangement is 12.5V .On connecting them in parallel and passing the current of 1.5 A , the potential difference between their ends is 6 V, calculate the two resistances.

When a diode is forward biased, it has a voltage drop of 0.5 V. The safe limit of current through the diode is 10 mA. If a battery of emf 1.5 V is used in the circuit, the value of minimum resistance to be connected in series with the diode so that the current does not exceed the safe limit is :

The figure shows three situations in which identical circular conducting loops are in uniform magnetic fields that are either increasing (Inc) or decreasing (Dec) in magnitude at identical rates. In each, the dashed line coincides with a diameter. Rank the situations according to the magnitude of the current induced in the loops, greatest first.