mtG Objective NCERT P The ith 52 ha between the ends of the
Last updated: 6/10/2023
mtG Objective NCERT P The ith 52 ha between the ends of the conductor is act 48 A metal conductor of length 1 m rotates vertical about one of its ends with an angular ve 5 rad s If the horizontal component of ear magnetic field is 0 2 x 10 T then the emf develope a 5 V b 5 mV c 50 V d 50 m 49 A rod of length I rotates with a uniform angle velocity about an axis passing through its midde point but normal to its length in a uniform magne field of induction B with its direction parallel to the axis of rotation The induced emf between the tw ends of the rod is BI a 2 BI h f c 51 A sliding rod AB of resistance R is shown in the figure Here magnetic field B is constant and is out of the paper Parallel wires have 50 A metallic rod of 1 m length is rotated with frequency of 50 revolution per second with one end hinged at the centre and the other end at the circumference of a circular metallic ring of radia I m about an axis passing through the centre and perpendicular to the plane of the ring A constant uniform magnetic field of 1 T parallel to the au is present everywhere The emf between the centre and the metallic ring is a 157 V b 117 V c 127 V d 137 V c v Bd no resistance and the rod is moving with constant velocity v The current in the sliding rod AB when switch S is closed at time t 0 is a R v Bd R t C RIC b zero b d 2BP d OF v Bd R v Bd R URC RC ENERGY CONSIDERATION A QUANTITATIVE STUDY 52 A conducting metal circular wire loop of radius r is placed perpendicular to a magnetic field which varies with time as B Be where B and t are constants at time t 0 If the resistance of the loop is R then the heat generated in the loop after a long Bectromagnetic Induction a c a B c 2TR BR Birw 2R TR 53 In a uniform magnetic field B a wire in the form of a semicircle of radius r rotates about the diameter of the circle with angular frequency to The axis 59 of rotation is perpendicular to the field If the total resistance of the circuit is R the mean power generated per period of rotation is Baru 2R b b a 5 s c 0 05 l s d B 2TR Bir 8R Bitr 8R SL A circular coil of radius 6 cm and 20 turns rotates about its vertical diameter with an angular speed of of magnitude 2 x 10 T If the coil form a closed 40 rad s in a uniform horizontal magnetic field loop of resistance 8 22 then the average power loss due to joule heating is a 2 07 x 10 W c 3 14 x 10 W b 1 23 x 10 W d 1 80 x 10 W 55 A circuit area 0 01 m is kept inside a magnetic field which is normal to its plane The magnetic field changes from 2 tesla to 1 tesla in 1 millisecond If the resistance of the circuit is 2 2 The rate of heat evolved is b 501 s d 0 5J s EDDY CURRENTS 56 A metal plate can be heated by a passing either a direct or alternating current through the plate b placing in a time varying magnetic field 58 c placing in a space varying magnetic field but does not vary with time d both a and b are correct 57 Identify the wrong statement a Eddy currents are produced in a steady magnetic field b Eddy currents can be minimized by using laminated core c Induction furnace uses eddy current to produce heat d Eddy current can be used to produce breaking 60 61