Class 10 Science Chapter 12 Magnetic Effects of Electric Current

Class 10 Science Chapter 12 Magnetic Effects of Electric Current

Question: A current-carrying conductor produces a ………. field around it.
Answer: Magnetic

Question: The magnetic field lines around a straight current-carrying conductor form ………. loops.
Answer: Concentric

Question: The direction of the magnetic field around a conductor can be determined using the ………. rule.
Answer: Right-hand thumb

Question: The SI unit of magnetic field strength is ……….
Answer: Tesla

Question: A region where the magnetic force can be detected is called a ……….
Answer: Magnetic field

Question: The magnetic field inside a solenoid is ………. throughout its length.
Answer: Uniform

Question: A solenoid is a coil of wire wound in the shape of a ……….
Answer: Cylinder

Question: The magnetic field produced by a solenoid increases with an increase in the ………. of current.
Answer: Strength

Question: The magnetic field due to a current-carrying circular loop is ………. at the center of the loop.
Answer: Maximum

Question: A bar magnet has two poles: ………. and ……….
Answer: North, south

Question: Magnetic field lines always emerge from the ………. pole and merge at the ………. pole of a magnet.
Answer: North, south

Question: Magnetic field lines never ………. each other.
Answer: Intersect

Question: A device that uses the magnetic effect of electric current to detect current is called a ……….
Answer: Galvanometer

Question: The magnetic field strength inside a solenoid depends on the number of ………. per unit length.
Answer: Turns

Question: The force experienced by a current-carrying conductor placed in a magnetic field is maximum when the conductor is ………. to the magnetic field.
Answer: Perpendicular

Question: The working principle of an electric motor is based on the ………. experienced by a current-carrying conductor in a magnetic field.
Answer: Force

Question: In an electric motor, the energy conversion is from ………. energy to ………. energy.
Answer: Electrical, mechanical

Question: The split rings in an electric motor are used as a ……….
Answer: Commutator

Question: The magnetic field outside a current-carrying solenoid is similar to that of a ………. magnet.
Answer: Bar

Question: Electromagnetic induction is the process of generating ………. by changing the magnetic field.
Answer: Electric current

Question: The SI unit of magnetic flux is ……….
Answer: Weber

Question: Faraday’s law of electromagnetic induction states that the induced emf is directly proportional to the rate of change of ……….
Answer: Magnetic flux

Question: The direction of induced current is given by ……….
Answer: Fleming’s right-hand rule

Question: An electric generator converts ………. energy into ………. energy.
Answer: Mechanical, electrical

Question: In a generator, the direction of induced current changes after every ………. revolution of the coil.
Answer: Half

Question: The frequency of alternating current in India is ………. Hz.
Answer: 50

Question: A device that changes the voltage of an alternating current is called a ……….
Answer: Transformer

Question: The core of a transformer is made of ………. to reduce energy losses.
Answer: Soft iron

Question: The efficiency of a transformer is maximum when energy losses due to ………. and ………. are minimized.
Answer: Heat, eddy currents

Question: In Fleming’s left-hand rule, the thumb represents the ……….
Answer: Force

Question: The earth’s magnetic field protects us from harmful ………. radiations.
Answer: Cosmic

Question: The angle between the magnetic axis and the geographical axis is called ……….
Answer: Magnetic declination

Question: The magnetic field at the center of a current-carrying circular loop is ………. proportional to the radius of the loop.
Answer: Inversely

Question: The magnetic field produced by a current-carrying wire decreases as the distance from the wire ……….
Answer: Increases

Question: A moving charge experiences a force in a magnetic field, except when it moves ………. to the field.
Answer: Parallel

Question: The magnetic force on a charged particle is given by the formula ……….
Answer: F=qvBsin⁡θF = qvB \sin\theta

Question: A galvanometer can be converted into an ammeter by connecting a ………. resistance in parallel.
Answer: Low

Question: The instrument used to measure the potential difference across a component is called a ……….
Answer: Voltmeter

Question: The poles of a magnet cannot be ……….
Answer: Separated

Question: A magnetic needle, when freely suspended, always aligns itself in the ………. direction.
Answer: North-south

Question: The magnitude of the induced current depends on the ………. of change of magnetic flux.
Answer: Rate

Question: The magnetic field lines around a straight conductor form ………. patterns.
Answer: Circular

Question: In an alternating current, the direction of current changes ……….
Answer: Periodically

Question: A device that uses electromagnetic induction to generate electricity is called a ……….
Answer: Generator

Question: The armature of an electric motor is made of ………. wires wound around a core.
Answer: Copper

Question: The magnetic effect of current was discovered by ……….
Answer: Hans Christian Oersted

Question: The south pole of a magnet attracts the ………. pole of another magnet.
Answer: North

Question: The strength of the earth’s magnetic field is maximum near the ……….
Answer: Poles

Question: The magnetic field inside a toroid is ……….
Answer: Uniform

Question: The coil of a galvanometer is wound on a ………. core.
Answer: Soft iron

Question: A wire carrying current in a magnetic field experiences a ………. force.
Answer: Magnetic

Question: Magnetic field lines are denser near the ………. of a magnet.
Answer: Poles

Question: An electric bell works on the principle of ……….
Answer: Electromagnetism

Question: The angle of dip at the magnetic equator is ……….
Answer: Zero

Question: A freely suspended bar magnet aligns itself with the ………. magnetic field.
Answer: Earth’s

Question: The resistance of an ideal voltmeter is ……….
Answer: Infinite

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