Magnetic Effects of Electric Current
Physics ⇒ Electricity and Magnetism
Magnetic Effects of Electric Current starts at 9 and continues till grade 12.
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A beam of electrons is moving horizontally from west to east. If the magnetic field is vertically upwards, what is the direction of the force on the electrons?
A charged particle enters a magnetic field at an angle of 0° with respect to the field direction. What is the force acting on it?
A current of 3 A flows through a straight conductor. What will be the direction of the magnetic field at a point above the conductor if the current flows from south to north?
A proton moves perpendicular to a uniform magnetic field. What is the shape of its path?
Describe the working principle of an electric motor.
A beam of electrons is moving horizontally from west to east. If the magnetic field is vertically upwards, what is the direction of the force on the electrons?
A charged particle enters a magnetic field at an angle of 0° with respect to the field direction. What is the force acting on it?
A current of 3 A flows through a straight conductor. What will be the direction of the magnetic field at a point above the conductor if the current flows from south to north?
The force on a current-carrying conductor in a magnetic field is maximum when the angle between the current and the magnetic field is (1) 0° (2) 45° (3) 90° (4) 180°
Which of the following devices works on the principle of the magnetic effect of electric current? (1) Electric bell (2) Electric heater (3) Electric fan (4) Electric bulb
Which of the following factors does NOT affect the strength of the magnetic field inside a solenoid? (1) Number of turns (2) Current (3) Length of solenoid (4) Material of core
Which of the following is NOT a property of magnetic field lines? (1) They never intersect. (2) They form closed loops. (3) They start from the north pole and end at the south pole outside the magnet. (4) They are parallel to each other inside a bar magnet.
A solenoid is a coil of wire with ________ turns, usually wound in the shape of a cylinder.
If the current in a circular loop is doubled, the magnetic field at its center will ________.
The magnetic field at the center of a circular coil of radius r carrying current I is given by ________.
The magnetic field due to a current-carrying straight wire at a point is inversely proportional to the ________ from the wire.
If the direction of current in a solenoid is reversed, the polarity of its ends will also reverse. True or False?
The force per unit length between two parallel current-carrying conductors is used to define the ampere. True or False?
True or False: The direction of induced current in a coil is given by Lenz’s law.
True or False: The magnetic field inside a long, straight solenoid is uniform.
