241 If the plane of the rectangular coil is parallel to the magnetic field (i.e radial magnetic field) the torque on the coil is_____________________? Physics Medium Full question → A τ = NIAB cosφ B τ = NIAB sinφ C τ = NIAB tanφ D τ = NIAB
242 A magnetic compass will be deflected if it is kept near a____________________? Physics Medium Full question → A charge in motion B charge at rest C both D none
243 When a particle of charge q and mass m enters into a uniform magnetic field B moving with a velocity v perpendicular to the direction for the field it describes a circular path of radius___________________? Physics Medium Full question → A R=qB/mV B R=mV/qB C R=qmV/B D R=qmB/V
244 A current carrying conductor is placed in a uniform magnetic field parallel to it. The magnetic force experienced by the conductor is _____________________? Physics Medium Full question → A F=1/B B F=1/Bsinθ C F/0 D F=1/Bcosθ
245 If a current carrying solenoid is suspended freely it will__________________? Physics Medium Full question → A be rotating B come to rest in N-S direction C vibrating like galvanometer needle D comes to rest after rotation
246 A particle of mass m charge q and speed V enters a uniform magnetic radius r. The radius r of the circle is_________________? Physics Medium Full question → A independent mass m B directly proportional to m C directly proportional to q D directly proportional to B
247 A wheat stone bridge is said to be balanced when____________________? Physics Medium Full question → A maximum current flows through the galvanometer branch B minimum current flows through the galvanometer branch C potential difference across galvanometer branch is maximum D potential difference across galvanometer branch is zero
248 A galvanometer basically is an instrument used to ____________________? Physics Medium Full question → A detect current in a circuit B measure current flowing through a circuit C measure voltage across a circuit D measure potential difference between two points in a circuit
249 Coil of a galvanometer is suspended in a radial magnetic field so that the deflecting torque on the coil is always___________________? Physics Medium Full question → A BINA cosa B BINA sina C BINA tana D BINA
250 A sensitive galvanometer gives full-scale deflection with 100 mV. If the resistance of the galvanometer is 50? the maximum current that can flow through safely is__________________? Physics Medium Full question → A 2.0 mA B 20 mA C 200 mA D 0.2 mA
251 In a multi range ammeter as the range increases _____________________? Physics Medium Full question → A shunt value decreases B shunt value increases C shunt value remains the same D none of the above
252 Which one of the following is not an electromechanical instrument ? Physics Medium Full question → A galvanometer B voltmeter C ammeter D AC transformer and DC generator
253 When the coil of the galvanometer is in equilibrium then the deflecting couple is____________________? Physics Medium Full question → A zero B equal to the restoring couple C greater than the restoring couple D smaller than the restoring couple
254 An electron enters a region where the electric field E is perpendicular to the magnetic field B. It will suffer no deflection if_________________? Physics Medium Full question → A E = BeV B B = eE/V C E = BV D E = BeV/2
255 The standard vector symbol for flux density is ____________________? Physics Medium Full question → A M B L C H D B
256 SI unit of flux density is____________________? Physics Medium Full question → A NA-1m-1 B NAm-1 C NmA-1 D NmA-2
257 The relationship between Tesla and smaller unit Gauss of magnetic induction is given by_________________? Physics Medium Full question → A 1T = 103 G B 1T = 10-4 G C 1T = 10-2 G D 1T = 104 G
258 Which one of the following material is most suitable for making core of an electromagnet ? Physics Medium Full question → A air B steel C Cu-Ni alloy D soft iron
259 A magnetic field___________________? Physics Medium Full question → A always exerts a force on a charged particle B never exerts a force on a charged particles C exerts a force if the charged particle is moving in the direction of the magnetic field lines D exerts a force if the charged particle is moving perpendicular to the magnetic field lines
260 Two parallel wires carrying currents in the opposite directions____________________? Physics Medium Full question → A repel each other B attract each other C have no effect upon each other D they cancel out their individual magnetic fields