अलीपुर जूलॉजिकल गार्डन | 03 December 2021 | Daily Current Affairs

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Two concentric coils of 10 turns each are placed in the same plane. Their radii are 20 cm and 40 cm and carry 0.2 A and 0.3 A current respectively in opposite directions. The magnetic induction (in tesla) at the centre is

A rectangular loop of sides 10cm and 5cm carrying a current I of 12A is placed in different orienctations as shown in the figure If there is a uniform magnetic field of 0.3 T in the positive z-direction, in which orientations the loop would be in (i) stable equilibrium and (ii) unstable equilibrium .

A rectangular loop of sides 10 cm and 5 cm carrying a current 1 of 12 A is placed in different orientations as shown in the figures below : ltBrgt If there is a uniform magnetic field of 0.3 T in the positive z direction, in which orientations the loop would be in (i) stable equilibrium ?

A long circular tube of length 10 m and radius 0.3 m carries a current I along its curved surface as shown . A wire - loop of resistance 0.005 ohm and of radius 0.1 m is placed inside the tube its axis coinciding with the axis of the tube . The current varies as I = I_(0)cos(300 t) where I_(0) is constant. If the magnetic moment of the loop is Nmu_(0)I_(0) sin (300 t) , then 'N' is

A solenoid of 2000 turns is wound over a length of 0.3 m. The area aof cross section is 1.3 xx 10^(-3) m^(2) . Around its central seciton, a coil of 300 turns is closely wound. If an initial current of 2 A is reversed in 0.25 s, find the e.m.f induced in the coil .

The electric current in a discharging R-C circuit is given by i=i_0e^(-t/(RC)) where i_0 R and C are constant parameters and t is time. Let i_0=2.00A , R=6.00xx10^5 ohm and C=0.500 muF . a. Find the current at t=0.3 s. b. Find the rate of change of current at t=0.3 s. Find approximately the current at t=0.31 s.