01. Lenz's Law
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Electro Magnetic Induction

154621 A metallic rod of length ' $L$ ' is rotated with an angular speed of ' $\omega$ ' normal to a uniform magnetic field ' $B$ ' about an axis passing through one end of rod as shown in figure. The induced emf will be:

1 $\frac{1}{2} \mathrm{~B}^{2} \mathrm{~L}^{2} \omega$
2 $\frac{1}{4} \mathrm{~B}^{2} \mathrm{~L}^{2} \omega$
3 $\frac{1}{2} \mathrm{BL}^{2} \omega$
4 $\frac{1}{4} \mathrm{~B}^{2} \mathrm{~L} \omega$
JEE Main-24.01.2023
Electro Magnetic Induction

154624 The magnetic flux through a coil of resistance $6.5 \Omega$ placed with its perpendicular to a uniform magnetic field varies with time $t$ (in s) $\phi=$ $\left(3 t^{2}+5 t+2\right)$ milli weber. What will be the induced current in the $t=10 \mathrm{~s}$ ?

1 $10 \mathrm{~A}$
2 $0.1 \mathrm{~A}$
3 $0.01 \mathrm{~A}$
4 $0.001 \mathrm{~A}$
Assam CEE-2020
Electro Magnetic Induction

154625 Metal rings ' $P$ ' and ' $Q$ ' are lying in the same plane, where current ' $I$ ' is increasing steadily. The induced current in metal rings is shown correctly in figure

1 a
2 b
3 c
4 d
MHT-CET 2020
Electro Magnetic Induction

154626 A rod of length $2 \mathrm{~m}$ slides with a speed of $5 \mathrm{~ms}$ 1 on a rectangular conducting frame as shown in figure. There exists a uniform magnetic field of $0.04 \mathrm{~T}$ perpendiculars to the plane of the figure. If the resistance of the $\operatorname{rod}$ is $3 \Omega$. The current through the rod is :

1 $75 \mathrm{~mA}$
2 $133 \mathrm{~mA}$
3 $0.75 \mathrm{~A}$
4 $1.33 \mathrm{~A}$
Karnataka CET-2020
Electro Magnetic Induction

154627 A long metal rod of length ' $L$ ' completes the circuit as shown. The area of the circuit is perpendicular to magnetic field ' $B$ '. Total resistance of the circuits is ' $R$ '. The force needed to move the rod in the direction as shown with constant speed ' $V$ ' is

1 $\frac{\mathrm{B}^{2} \mathrm{~L}^{2} \mathrm{~V}}{\mathrm{R}}$
2 $\frac{\mathrm{BLV}^{2}}{\mathrm{R}}$
3 $\frac{B^{2} L V}{R}$
4 $\frac{\text { BLV }}{\mathrm{R}}$
MHT-CET 2020
NEET DIGITAL LIBRARY
Electro Magnetic Induction

154621 A metallic rod of length ' $L$ ' is rotated with an angular speed of ' $\omega$ ' normal to a uniform magnetic field ' $B$ ' about an axis passing through one end of rod as shown in figure. The induced emf will be:

1 $\frac{1}{2} \mathrm{~B}^{2} \mathrm{~L}^{2} \omega$
2 $\frac{1}{4} \mathrm{~B}^{2} \mathrm{~L}^{2} \omega$
3 $\frac{1}{2} \mathrm{BL}^{2} \omega$
4 $\frac{1}{4} \mathrm{~B}^{2} \mathrm{~L} \omega$
JEE Main-24.01.2023
Electro Magnetic Induction

154624 The magnetic flux through a coil of resistance $6.5 \Omega$ placed with its perpendicular to a uniform magnetic field varies with time $t$ (in s) $\phi=$ $\left(3 t^{2}+5 t+2\right)$ milli weber. What will be the induced current in the $t=10 \mathrm{~s}$ ?

1 $10 \mathrm{~A}$
2 $0.1 \mathrm{~A}$
3 $0.01 \mathrm{~A}$
4 $0.001 \mathrm{~A}$
Assam CEE-2020
Electro Magnetic Induction

154625 Metal rings ' $P$ ' and ' $Q$ ' are lying in the same plane, where current ' $I$ ' is increasing steadily. The induced current in metal rings is shown correctly in figure

1 a
2 b
3 c
4 d
MHT-CET 2020
Electro Magnetic Induction

154626 A rod of length $2 \mathrm{~m}$ slides with a speed of $5 \mathrm{~ms}$ 1 on a rectangular conducting frame as shown in figure. There exists a uniform magnetic field of $0.04 \mathrm{~T}$ perpendiculars to the plane of the figure. If the resistance of the $\operatorname{rod}$ is $3 \Omega$. The current through the rod is :

1 $75 \mathrm{~mA}$
2 $133 \mathrm{~mA}$
3 $0.75 \mathrm{~A}$
4 $1.33 \mathrm{~A}$
Karnataka CET-2020
Electro Magnetic Induction

154627 A long metal rod of length ' $L$ ' completes the circuit as shown. The area of the circuit is perpendicular to magnetic field ' $B$ '. Total resistance of the circuits is ' $R$ '. The force needed to move the rod in the direction as shown with constant speed ' $V$ ' is

1 $\frac{\mathrm{B}^{2} \mathrm{~L}^{2} \mathrm{~V}}{\mathrm{R}}$
2 $\frac{\mathrm{BLV}^{2}}{\mathrm{R}}$
3 $\frac{B^{2} L V}{R}$
4 $\frac{\text { BLV }}{\mathrm{R}}$
MHT-CET 2020
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Electro Magnetic Induction

154621 A metallic rod of length ' $L$ ' is rotated with an angular speed of ' $\omega$ ' normal to a uniform magnetic field ' $B$ ' about an axis passing through one end of rod as shown in figure. The induced emf will be:

1 $\frac{1}{2} \mathrm{~B}^{2} \mathrm{~L}^{2} \omega$
2 $\frac{1}{4} \mathrm{~B}^{2} \mathrm{~L}^{2} \omega$
3 $\frac{1}{2} \mathrm{BL}^{2} \omega$
4 $\frac{1}{4} \mathrm{~B}^{2} \mathrm{~L} \omega$
JEE Main-24.01.2023
Electro Magnetic Induction

154624 The magnetic flux through a coil of resistance $6.5 \Omega$ placed with its perpendicular to a uniform magnetic field varies with time $t$ (in s) $\phi=$ $\left(3 t^{2}+5 t+2\right)$ milli weber. What will be the induced current in the $t=10 \mathrm{~s}$ ?

1 $10 \mathrm{~A}$
2 $0.1 \mathrm{~A}$
3 $0.01 \mathrm{~A}$
4 $0.001 \mathrm{~A}$
Assam CEE-2020
Electro Magnetic Induction

154625 Metal rings ' $P$ ' and ' $Q$ ' are lying in the same plane, where current ' $I$ ' is increasing steadily. The induced current in metal rings is shown correctly in figure

1 a
2 b
3 c
4 d
MHT-CET 2020
Electro Magnetic Induction

154626 A rod of length $2 \mathrm{~m}$ slides with a speed of $5 \mathrm{~ms}$ 1 on a rectangular conducting frame as shown in figure. There exists a uniform magnetic field of $0.04 \mathrm{~T}$ perpendiculars to the plane of the figure. If the resistance of the $\operatorname{rod}$ is $3 \Omega$. The current through the rod is :

1 $75 \mathrm{~mA}$
2 $133 \mathrm{~mA}$
3 $0.75 \mathrm{~A}$
4 $1.33 \mathrm{~A}$
Karnataka CET-2020
Electro Magnetic Induction

154627 A long metal rod of length ' $L$ ' completes the circuit as shown. The area of the circuit is perpendicular to magnetic field ' $B$ '. Total resistance of the circuits is ' $R$ '. The force needed to move the rod in the direction as shown with constant speed ' $V$ ' is

1 $\frac{\mathrm{B}^{2} \mathrm{~L}^{2} \mathrm{~V}}{\mathrm{R}}$
2 $\frac{\mathrm{BLV}^{2}}{\mathrm{R}}$
3 $\frac{B^{2} L V}{R}$
4 $\frac{\text { BLV }}{\mathrm{R}}$
MHT-CET 2020
For More Updates join with Us
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
Electro Magnetic Induction

154621 A metallic rod of length ' $L$ ' is rotated with an angular speed of ' $\omega$ ' normal to a uniform magnetic field ' $B$ ' about an axis passing through one end of rod as shown in figure. The induced emf will be:

1 $\frac{1}{2} \mathrm{~B}^{2} \mathrm{~L}^{2} \omega$
2 $\frac{1}{4} \mathrm{~B}^{2} \mathrm{~L}^{2} \omega$
3 $\frac{1}{2} \mathrm{BL}^{2} \omega$
4 $\frac{1}{4} \mathrm{~B}^{2} \mathrm{~L} \omega$
JEE Main-24.01.2023
Electro Magnetic Induction

154624 The magnetic flux through a coil of resistance $6.5 \Omega$ placed with its perpendicular to a uniform magnetic field varies with time $t$ (in s) $\phi=$ $\left(3 t^{2}+5 t+2\right)$ milli weber. What will be the induced current in the $t=10 \mathrm{~s}$ ?

1 $10 \mathrm{~A}$
2 $0.1 \mathrm{~A}$
3 $0.01 \mathrm{~A}$
4 $0.001 \mathrm{~A}$
Assam CEE-2020
Electro Magnetic Induction

154625 Metal rings ' $P$ ' and ' $Q$ ' are lying in the same plane, where current ' $I$ ' is increasing steadily. The induced current in metal rings is shown correctly in figure

1 a
2 b
3 c
4 d
MHT-CET 2020
Electro Magnetic Induction

154626 A rod of length $2 \mathrm{~m}$ slides with a speed of $5 \mathrm{~ms}$ 1 on a rectangular conducting frame as shown in figure. There exists a uniform magnetic field of $0.04 \mathrm{~T}$ perpendiculars to the plane of the figure. If the resistance of the $\operatorname{rod}$ is $3 \Omega$. The current through the rod is :

1 $75 \mathrm{~mA}$
2 $133 \mathrm{~mA}$
3 $0.75 \mathrm{~A}$
4 $1.33 \mathrm{~A}$
Karnataka CET-2020
Electro Magnetic Induction

154627 A long metal rod of length ' $L$ ' completes the circuit as shown. The area of the circuit is perpendicular to magnetic field ' $B$ '. Total resistance of the circuits is ' $R$ '. The force needed to move the rod in the direction as shown with constant speed ' $V$ ' is

1 $\frac{\mathrm{B}^{2} \mathrm{~L}^{2} \mathrm{~V}}{\mathrm{R}}$
2 $\frac{\mathrm{BLV}^{2}}{\mathrm{R}}$
3 $\frac{B^{2} L V}{R}$
4 $\frac{\text { BLV }}{\mathrm{R}}$
MHT-CET 2020
NEET DIGITAL LIBRARY
Electro Magnetic Induction

154621 A metallic rod of length ' $L$ ' is rotated with an angular speed of ' $\omega$ ' normal to a uniform magnetic field ' $B$ ' about an axis passing through one end of rod as shown in figure. The induced emf will be:

1 $\frac{1}{2} \mathrm{~B}^{2} \mathrm{~L}^{2} \omega$
2 $\frac{1}{4} \mathrm{~B}^{2} \mathrm{~L}^{2} \omega$
3 $\frac{1}{2} \mathrm{BL}^{2} \omega$
4 $\frac{1}{4} \mathrm{~B}^{2} \mathrm{~L} \omega$
JEE Main-24.01.2023
Electro Magnetic Induction

154624 The magnetic flux through a coil of resistance $6.5 \Omega$ placed with its perpendicular to a uniform magnetic field varies with time $t$ (in s) $\phi=$ $\left(3 t^{2}+5 t+2\right)$ milli weber. What will be the induced current in the $t=10 \mathrm{~s}$ ?

1 $10 \mathrm{~A}$
2 $0.1 \mathrm{~A}$
3 $0.01 \mathrm{~A}$
4 $0.001 \mathrm{~A}$
Assam CEE-2020
Electro Magnetic Induction

154625 Metal rings ' $P$ ' and ' $Q$ ' are lying in the same plane, where current ' $I$ ' is increasing steadily. The induced current in metal rings is shown correctly in figure

1 a
2 b
3 c
4 d
MHT-CET 2020
Electro Magnetic Induction

154626 A rod of length $2 \mathrm{~m}$ slides with a speed of $5 \mathrm{~ms}$ 1 on a rectangular conducting frame as shown in figure. There exists a uniform magnetic field of $0.04 \mathrm{~T}$ perpendiculars to the plane of the figure. If the resistance of the $\operatorname{rod}$ is $3 \Omega$. The current through the rod is :

1 $75 \mathrm{~mA}$
2 $133 \mathrm{~mA}$
3 $0.75 \mathrm{~A}$
4 $1.33 \mathrm{~A}$
Karnataka CET-2020
Electro Magnetic Induction

154627 A long metal rod of length ' $L$ ' completes the circuit as shown. The area of the circuit is perpendicular to magnetic field ' $B$ '. Total resistance of the circuits is ' $R$ '. The force needed to move the rod in the direction as shown with constant speed ' $V$ ' is

1 $\frac{\mathrm{B}^{2} \mathrm{~L}^{2} \mathrm{~V}}{\mathrm{R}}$
2 $\frac{\mathrm{BLV}^{2}}{\mathrm{R}}$
3 $\frac{B^{2} L V}{R}$
4 $\frac{\text { BLV }}{\mathrm{R}}$
MHT-CET 2020