CBSE Class 10 Physics Magnetic Effect of Electric Current Worksheet Set C

Question. Identify the poles of the magnet in the given figure.
Answer: Both the poles facing each other represent south pole in nature as the magnetic field lines outside the magnet move from North to South Poles.

Read the passage carefully and answer any four questions from Hans christian Oersted, one of the leading scientists of the 19th century, play a crucial role in understanding electromagnetism. In 1820, he accidentally discovered that a compass needle got defected when an electric current passed through a metallic wire placed nearly. Through this observation Oersted showed that electricity and magnetic were related phenomenon. This research later created technologies such as radio, television and fibre optics. The unit of magnetic field was named as Oersted in his honour. Electromagnetism is the study of electromagnetic force. It is a type of interface that happens between electrically charged particles. The electromagnetic force generally exhibits electromagnetic fields like magnetic fields, electric fields and light, and is one of the four essential interactions commonly known as forces in nature. The other 3 important interactions are the strong interaction, gravitation and the weak.

Question. Oersted experiment is used to explain which effect of current ? 
(a) Electric field
(b) Magnetic field
(c) Both (a) and (b)
(d) None of these

Answer: B

Question. Which instrument helps to detect the presence of magnetic field at a point? 
(a) Strong magnet
(b) Solenoid
(c) Compass needle
(d) Current carrying line

Answer: C

Question. In the diagram below, the direction of magnetic field is:
(a) Clockwise
(b) Anti clockwise
(c) Not any fixed direction
(d) None of these

Answer: A

Question. On reversing the direction of the current in a wire, the magnetic fixed produced by it: 
(a) Gets reversed in direction
(b) Increase in strength
(c) Decreases in strength
(d) Remains unchanged in strength and direction

Answer: A

Read the passage carefully and answer the following questions from A magnet must exert an equal and opposite force on a currentcarrying conductor. We know that current is due to the charge in motion. Thus, it is evident that a charge moving in a magnetic field experiences a force. If the direction of motion is perpendicular to the direction of the magnetic field, the magnitude of force experienced depends upon the charge, velocity, and strength of the magnetic field. Fleming’s left-hand rule gives the direction of the magnetic force. 

Question. If a charged particle is moving along a magnetic field line, the magnetic force on the particle is: 
(a) along with its velocity.
(b) opposite to its velocity.
(c) perpendicular to its velocity.
(d) zero.

Answer: D

Question. An electron is travelling horizontally towards the east. A magnetic field in the vertically downward direction will exert a force in: 
(a) East
(b) West
(c) North
(d) South

Answer: D

Question. A uniform magnetic field exists from left to right on a surface. An electron and proton moving in the directions as shown in the figure will experience: 
(a) Forces both pointing into the plane of the surface.
(b) Forces both pointing out of the plane of the surface.
(c) The electron will experience into the plane and proton out of the plane.
(d) The electron will experience opposite to and proton along the direction of the uniform magnetic field.

Answer: A

Question. Magnetic field exerts no force on: 
(a) a stationary electric charge.
(b) a magnet.
(c) an electric charge moving perpendicular to its direction.
(d) an unmagnetized iron bar.

Answer: A

Question. In Fleming’s left-hand rule, the thumb’s direction shows the: 
(a) current
(b) field
(c) motion
(d) charge

Answer: C

Read the passage carefully and answer the following questions from The space surrounding a magnet in which magnetic force is exerted, is called a magnetic field. The direction of magnetic field lines at a place can be determined by using a compass needle. A compass needle placed near a magnet gets deflected due to the magnetic force exerted by the magnet. The north end of the needle of the compass indicates the direction of magnetic field at the point where it is placed. When the magnet shown in the diagram below is moving towards the coil, the galvanometer gives a reading to the right. 

Question. The direction of induced current is given by: 
(a) Right hand thumb rule
(b) Fleming’s right hand rule
(c) Fleming’s left hand rule
(d) Maxwell’s rule

Answer: B

Question. What is the condition of electromagnetic induction? 
(a) There must be a relative motion between the coil of wire and galvanometer.
(b) There must be a relative motion between the galvanometer and a magnet.
(c) There must be a relative motion between galvanometer and generator.
(d) There must be a relative motion between the coil of wire and a magnet.

Answer: D

Question. A student writes a few statements after studying the principles of electromagnetism and working of electric motor: 
(I) Fleming’s left hand rule is used to make electromagnet.
(II) Fleming’s left hand rule is used in electric motor.
(III) Fleming’s right hand rule is used in electric motor.
(IV) Right hand thumb rule is used in electric motor.
Choose the correct statement(s) from the following:
(a) Only (I)
(b) Only (II)
(c) (I) and (III)
(d) (II), (III) and (IV)

Answer: B

Question. When the magnet is moved away from the coil, it is observed that: 
(a) the galvanometer needle deflects to the left
(b) the galvanometer needle deflects to the right
(c) the galvanometer needle first deflects to the left and then to the right
(d) the galvanometer needle first deflects to the right and then to the left.

Answer: A

Question. The induced current is highest when: 
(a) direction of magnetic field is parallel to the direction of motion of coil.
(b) direction of magnetic field is opposite to the direction of motion of coil.
(c) direction of magnetic field is perpendicular to the direction of motion of coil.
(d) direction of magnetic field is in straight line to the direction of motion of coil.

Answer: C