STANDARD TENPART I & IICHAPTER : 4Magnetic Effects of Electric Current /15 0 votes, 0 avg 556 SCIENCE AND TECHNOLOGY – Chapter 4 Magnetic Effects of Electric Current 1 / 15 A current flows in a wire running between the S and N poles of a magnet lying horizontally as shown in the figure below: The force on the wire due to the magnet is directed: From N to S From S to N Vertically downwards Vertically upwards 2 / 15 The frequency of electricity produced by DC generator is equal to 0 Hz 50 Hz 100 Hz 200 Hz 3 / 15 Which of the following diagrams correctly shows the magnetic field produced by a current- carrying wire? A B C D 4 / 15 An electric motor is a device which transforms Mechanical energy into electrical energy Electrical energy into mechanical energy Kinetic energy into potential energy Electrical energy into Potential energy 5 / 15 The shape of the magnetic field lines produced by a current carrying conductor are: Straight lines Concentric circles Concentric ellipse Concentric parabolas 6 / 15 A coil of insulated copper wire is connected to a galvanometer forming a loop and a magnet is:A: Held stationaryB: Moved away along its axisC: Moved towards along its axisThere will be a induced current in: A only A and B only B and C only A, B and C 7 / 15 If two circular coils can be arranged in any of the three situations as shown in the diagrams below, then their mutual induction will be: Maximum in situation a Maximum in situation b Maximum in situation c The same in all situations 8 / 15 A fuse should always be placed in the Live wire of the main circuit Neutral wire of the main circuit Earth wire of the main circuit Bothe live and neutral wire of the main circuit 9 / 15 A positive charge is moving towards a person. The direction of magnetic field lines will be in Clockwise direction Anticlockwise direction Vertically upward direction Vertically downward direction 10 / 15 An induced emf is produced when a magnet is moved into a coil. The magnitude of induced emf does not depend on: The speed with which the magnet is moved The number of turns of the coil The resistivity of the wire of the coil The strength of the magnet 11 / 15 The force exerted on a current carrying wire placed in a magnetic field is zero when the angle between wire and the direction of magnetic field is: 45° 60° 90° 180° 12 / 15 A current carrying conductor is held in exactly vertical direction. In order to produce a clockwise magnetic field around the conductor, the current should be passed in the conductor: From top to bottom From left to right From bottom to top From right to left 13 / 15 A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid: Will decrease Will increase Will become zero Will remain the same 14 / 15 The north pole of Earth’s magnet is in the: Geographical South Geographical East Geographical West Geographical North 15 / 15 The magnetic field lines outside a bar magnet: Originate from the South pole and end at its North Pole Originate from the North pole and end at its East Pole Originate from the North Pole and end at its South Pole Originate from the South pole and end at its West Pole Your score is 0% Restart quiz