Test 4 Code A 38 A capacitor of capacitance C is connected to a V volt potential Battery is then disconnected and inductor of inductance L is connected across the capacitor so that LC oscillations are set up The maximum current in the coil is C 1 3 V 1 3 4 39 The inductance of a closed packed coil of 400 turns is 8 mH A current of 5 mA is passed through it The magnetic flux per turn is Hg Permeability of free space 1 2 3 4x Ho Wb 1 3x 2L Ho Wb 4 0 4 Wb 40 A coil having n turns and resistance R is connected with a galvanometer of resistance 4R The combination is moved in time t such that magnetic flux per turn changes to flux 2 per turn The average induced current in the circuit is 5Rnt n 0 0 5Rt Rnt n Rt 2 2 v C 2VZ w dxxx 2x 4 41 A massless square loop of side carrying current i is suspended from a pulley as shown in the arrangement Lower edge of the loop is in transverse magnetic field B The minimum current i required in the loop to just move the block of mass m up the inclined plane is 2C Wb 3 42 1 2 3 4 Aakash Rank Booster Test Series for NEET 2020 mg sine mg cos BI 2 mg sine mg cose 2B 2mg sine 2 mg cose BI A conducting loop is placed in a magnetic field of strength B perpendicular to its plane Radius of loop is r current in the loop is i and linear mass density of loop is m Speed of any transverse wave in the loop will be 3 mg sine mg cos BI Bir m 2Bir m 2mv qE 3 43 A particle of charge q and mass m starts moving from origin under the action of an electric field Ei and B B with velocity v v The time after which its speed becomes 2v is 28 9 mvo 38 9 mvo 2 3 mv qE Bir 2m 4 2 Bir m 44 A conducting circular loop of radius r carries a constant current i It is placed in uniform magnetic field B such that B is perpendicular to plane of the loop Find the magnetic force acting on the loop 1 irB 2 2rriB 4 TriB 3 Zero 45 If current is passed in a spring then it 1 Gets compressed 2 Gets expanded 3 Oscillates 4 Remains unchanged