CBSE Class 10 Physics Magnetic Effects of Electric Current Assignment

Question : The phenomenon of electromagnetic induction is
a. the process of rotating a coil at an electric motor
b. the process of charging a body
c. the process of generating magnetic field due to a current passing through a coil
d. producing induced current in a coil due to relative motion between a magnet and the coil
Answer :  D
Explanation: When a straight coil and a magnet are moved relative to each other, a current is induced in the coil. This phenomenon is known as electromagnetic induction.
 
 
 
Question : Match the following with correct response.
U-26
a. 1-C, 2-B, 3-D, 4-A
b. 1-D, 2-A, 3-C, 4-B
c. 1-A, 2-C, 3-B, 4-D
d. 1-B, 2-D, 3-A, 4-C
Answer :  B
Explanation:
i. The direction of induced current in a straight conductor is given by Fleming’s right hand rule.
ii. It states that if we stretch the thumb, forefinger and the middle finger of right hand at right angles to one another in such a way that the forefinger points in the direction of magnetic field.
iii. Then, thumb gives the direction of motion of conductor (force), forefinger indicates direction of magnetic field and the middle finger points the direction of induced current.
iv. The direction of force which acts on the current-carrying conductor placed in a magnetic field is given by Fleming’s left hand rule. It states that if the forefinger, thumb and middle finger of left hand are stretched mutually perpendicular and the forefinger points along the direction of external magnetic field, middle finger indicates the direction of current, then thumb points along the direction of force acting on the conductor.
v. Electromagnetic induction is the process of generating electric current with a magnetic field. It occurs whenever a magnetic field and an electric conductor, such as a coil of wire, move relative to one another.
vi. High powered electrical appliances are connected to the earth by Earthing wire. 
 
 
 
Question : The fuse wire should have
a. Low resistance, High melting point
b. Low resistance, Low melting point
c. High resistance, High melting point
d. High resistance, Low melting point
Answer :  D
Explanation: A fuse wire has high resistance and low melting point so that it will melt if a current of large magnitude passes through the wire. 
 
 
Question : Identify the poles of a magnet in the figure. 
U-22
Answer :  The poles of a magnet are marked in the figure as we know that out side magnet field lines moves N S and inside the Magnet field lines moves S→ N .
U-24
 
 
Question : Identify the region, where the magnetic field around a current carrying solenoid is uniform.
Answer :    The magnetic field is uniform inside the magnet.
 
 
 
Question : Compare the permanent magnet and an electromagnet.
Answer : 

U-25
 
 
Question : A circular metallic loop is kept above the wire AB as shown below:
U-23
What is the direction of induced current produced in the loop, if the current flowing in the straight wire
i. is steady, i.e. does not vary?
ii. is increasing in magnitude?
Justify your answer in each case.
Answer : 
 i. The constant current flowing in the straight wire produces a constant magnetic field. Hence, no induced current is produced in the loop.
ii. Since current in the straight wire is changing, hence, induced current will be produced in clockwise direction.
 
 
Question : Draw an appropriate schematic diagram showing common domestic circuits and discuss the importance of fuse. Why is it that a burnt out fuse should be replaced by another fuse of identical rating?
Answer : 
U-27
A fuse in a circuit prevents damage to the appliances and the circuit due to overloading. Otherwise, the appliances or the circuit may be damaged.
When current in the circuit exceeds the value of fuse rating, the fuse wire burns due to overloading. This causes a gap in the circuit and the current stops flowing in the circuit.
This is done due to the reason so that the circuit or the appliances to be connected in the circuit continue functioning without any damage in future.

 


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