02. Motional Electromotive Force (MEF)
Electro Magnetic Induction

154667 Two straight conducting rails form a right angle as shown below. A conducting bar in contact with the rails starts at the vertex at time $t=0$ and moves with constant velocity of $v$ $=5 \mathrm{~m} / \mathrm{s}$ along them. A magnetic field with $B=$ $0.1 \mathrm{~T}$ is directed out of the page. The absolute value of the emf around the triangle at the time $\mathrm{t}=4 \mathrm{~s}$ will be ?

1 $10 \mathrm{~V}$
2 $15 \mathrm{~V}$
3 $20 \mathrm{~V}$
4 $30 \mathrm{~V}$
Electro Magnetic Induction

154668 A 800 turns coil of effective area $0.05 \mathrm{~m}^{2}$ is kept perpendicular to a magnetic field $5 \times 10^{-5} \mathrm{~T}$. When the plane of the coil is rotated by $90^{\circ}$ around any of its co-planar axis in $0.1 \mathrm{~s}$, the emf induced in the coil will be

1 $0.2 \mathrm{~V}$
2 $2 \times 10^{-3} \mathrm{~V}$
3 $0.02 \mathrm{~V}$
4 $2 \mathrm{~V}$
Electro Magnetic Induction

154669 A cycle wheel of radius $0.5 \mathrm{~m}$ is rotated with constant angular velocity of $10 \mathrm{rad} / \mathrm{s}$ in a region of magnetic field of $0.1 \mathrm{~T}$ which is perpendicular to the plane of the wheel. The EMF generated between its centre and the rim is

1 $0.25 \mathrm{~V}$
2 $0.125 \mathrm{~V}$
3 $0.5 \mathrm{~V}$
4 zero
Electro Magnetic Induction

154670 A $1 \mathrm{~m}$ long thin metal bar of negligible resistance weighing $1 \mathrm{~kg}$ rests on two metal supports as shown in the figure. The supports are connected in series to an ideal cell and a resistance. A uniform magnetic field $0.5 \mathrm{~T}$ is applied in the region normal to the plane of the paper and into the paper. Maximum emf that the cell can have without breaking the circuit in volt is
(Acceleration due to gravity $=10 \mathrm{~ms}^{-2}$ )

1 $100 \mathrm{~V}$
2 $200 \mathrm{~V}$
3 $400 \mathrm{~V}$
4 $500 \mathrm{~V}$
Electro Magnetic Induction

154671 A square loop of side $10 \mathrm{~cm}$ and resistance $5 \Omega$ is placed vertically in East-West plane. A uniform magnetic field of 1 Tesla is set across the plane in North-East direction. The magnetic field becomes Zero in $700 \mathrm{~ms}$ at a steady rate. The magnitude of induced emf during this interval is

1 $1 \mathrm{mV}$
2 $10 \mathrm{mV}$
3 $100 \mathrm{mV}$
4 $1 \mathrm{~V}$
Electro Magnetic Induction

154667 Two straight conducting rails form a right angle as shown below. A conducting bar in contact with the rails starts at the vertex at time $t=0$ and moves with constant velocity of $v$ $=5 \mathrm{~m} / \mathrm{s}$ along them. A magnetic field with $B=$ $0.1 \mathrm{~T}$ is directed out of the page. The absolute value of the emf around the triangle at the time $\mathrm{t}=4 \mathrm{~s}$ will be ?

1 $10 \mathrm{~V}$
2 $15 \mathrm{~V}$
3 $20 \mathrm{~V}$
4 $30 \mathrm{~V}$
Electro Magnetic Induction

154668 A 800 turns coil of effective area $0.05 \mathrm{~m}^{2}$ is kept perpendicular to a magnetic field $5 \times 10^{-5} \mathrm{~T}$. When the plane of the coil is rotated by $90^{\circ}$ around any of its co-planar axis in $0.1 \mathrm{~s}$, the emf induced in the coil will be

1 $0.2 \mathrm{~V}$
2 $2 \times 10^{-3} \mathrm{~V}$
3 $0.02 \mathrm{~V}$
4 $2 \mathrm{~V}$
Electro Magnetic Induction

154669 A cycle wheel of radius $0.5 \mathrm{~m}$ is rotated with constant angular velocity of $10 \mathrm{rad} / \mathrm{s}$ in a region of magnetic field of $0.1 \mathrm{~T}$ which is perpendicular to the plane of the wheel. The EMF generated between its centre and the rim is

1 $0.25 \mathrm{~V}$
2 $0.125 \mathrm{~V}$
3 $0.5 \mathrm{~V}$
4 zero
Electro Magnetic Induction

154670 A $1 \mathrm{~m}$ long thin metal bar of negligible resistance weighing $1 \mathrm{~kg}$ rests on two metal supports as shown in the figure. The supports are connected in series to an ideal cell and a resistance. A uniform magnetic field $0.5 \mathrm{~T}$ is applied in the region normal to the plane of the paper and into the paper. Maximum emf that the cell can have without breaking the circuit in volt is
(Acceleration due to gravity $=10 \mathrm{~ms}^{-2}$ )

1 $100 \mathrm{~V}$
2 $200 \mathrm{~V}$
3 $400 \mathrm{~V}$
4 $500 \mathrm{~V}$
Electro Magnetic Induction

154671 A square loop of side $10 \mathrm{~cm}$ and resistance $5 \Omega$ is placed vertically in East-West plane. A uniform magnetic field of 1 Tesla is set across the plane in North-East direction. The magnetic field becomes Zero in $700 \mathrm{~ms}$ at a steady rate. The magnitude of induced emf during this interval is

1 $1 \mathrm{mV}$
2 $10 \mathrm{mV}$
3 $100 \mathrm{mV}$
4 $1 \mathrm{~V}$
Electro Magnetic Induction

154667 Two straight conducting rails form a right angle as shown below. A conducting bar in contact with the rails starts at the vertex at time $t=0$ and moves with constant velocity of $v$ $=5 \mathrm{~m} / \mathrm{s}$ along them. A magnetic field with $B=$ $0.1 \mathrm{~T}$ is directed out of the page. The absolute value of the emf around the triangle at the time $\mathrm{t}=4 \mathrm{~s}$ will be ?

1 $10 \mathrm{~V}$
2 $15 \mathrm{~V}$
3 $20 \mathrm{~V}$
4 $30 \mathrm{~V}$
Electro Magnetic Induction

154668 A 800 turns coil of effective area $0.05 \mathrm{~m}^{2}$ is kept perpendicular to a magnetic field $5 \times 10^{-5} \mathrm{~T}$. When the plane of the coil is rotated by $90^{\circ}$ around any of its co-planar axis in $0.1 \mathrm{~s}$, the emf induced in the coil will be

1 $0.2 \mathrm{~V}$
2 $2 \times 10^{-3} \mathrm{~V}$
3 $0.02 \mathrm{~V}$
4 $2 \mathrm{~V}$
Electro Magnetic Induction

154669 A cycle wheel of radius $0.5 \mathrm{~m}$ is rotated with constant angular velocity of $10 \mathrm{rad} / \mathrm{s}$ in a region of magnetic field of $0.1 \mathrm{~T}$ which is perpendicular to the plane of the wheel. The EMF generated between its centre and the rim is

1 $0.25 \mathrm{~V}$
2 $0.125 \mathrm{~V}$
3 $0.5 \mathrm{~V}$
4 zero
Electro Magnetic Induction

154670 A $1 \mathrm{~m}$ long thin metal bar of negligible resistance weighing $1 \mathrm{~kg}$ rests on two metal supports as shown in the figure. The supports are connected in series to an ideal cell and a resistance. A uniform magnetic field $0.5 \mathrm{~T}$ is applied in the region normal to the plane of the paper and into the paper. Maximum emf that the cell can have without breaking the circuit in volt is
(Acceleration due to gravity $=10 \mathrm{~ms}^{-2}$ )

1 $100 \mathrm{~V}$
2 $200 \mathrm{~V}$
3 $400 \mathrm{~V}$
4 $500 \mathrm{~V}$
Electro Magnetic Induction

154671 A square loop of side $10 \mathrm{~cm}$ and resistance $5 \Omega$ is placed vertically in East-West plane. A uniform magnetic field of 1 Tesla is set across the plane in North-East direction. The magnetic field becomes Zero in $700 \mathrm{~ms}$ at a steady rate. The magnitude of induced emf during this interval is

1 $1 \mathrm{mV}$
2 $10 \mathrm{mV}$
3 $100 \mathrm{mV}$
4 $1 \mathrm{~V}$
Electro Magnetic Induction

154667 Two straight conducting rails form a right angle as shown below. A conducting bar in contact with the rails starts at the vertex at time $t=0$ and moves with constant velocity of $v$ $=5 \mathrm{~m} / \mathrm{s}$ along them. A magnetic field with $B=$ $0.1 \mathrm{~T}$ is directed out of the page. The absolute value of the emf around the triangle at the time $\mathrm{t}=4 \mathrm{~s}$ will be ?

1 $10 \mathrm{~V}$
2 $15 \mathrm{~V}$
3 $20 \mathrm{~V}$
4 $30 \mathrm{~V}$
Electro Magnetic Induction

154668 A 800 turns coil of effective area $0.05 \mathrm{~m}^{2}$ is kept perpendicular to a magnetic field $5 \times 10^{-5} \mathrm{~T}$. When the plane of the coil is rotated by $90^{\circ}$ around any of its co-planar axis in $0.1 \mathrm{~s}$, the emf induced in the coil will be

1 $0.2 \mathrm{~V}$
2 $2 \times 10^{-3} \mathrm{~V}$
3 $0.02 \mathrm{~V}$
4 $2 \mathrm{~V}$
Electro Magnetic Induction

154669 A cycle wheel of radius $0.5 \mathrm{~m}$ is rotated with constant angular velocity of $10 \mathrm{rad} / \mathrm{s}$ in a region of magnetic field of $0.1 \mathrm{~T}$ which is perpendicular to the plane of the wheel. The EMF generated between its centre and the rim is

1 $0.25 \mathrm{~V}$
2 $0.125 \mathrm{~V}$
3 $0.5 \mathrm{~V}$
4 zero
Electro Magnetic Induction

154670 A $1 \mathrm{~m}$ long thin metal bar of negligible resistance weighing $1 \mathrm{~kg}$ rests on two metal supports as shown in the figure. The supports are connected in series to an ideal cell and a resistance. A uniform magnetic field $0.5 \mathrm{~T}$ is applied in the region normal to the plane of the paper and into the paper. Maximum emf that the cell can have without breaking the circuit in volt is
(Acceleration due to gravity $=10 \mathrm{~ms}^{-2}$ )

1 $100 \mathrm{~V}$
2 $200 \mathrm{~V}$
3 $400 \mathrm{~V}$
4 $500 \mathrm{~V}$
Electro Magnetic Induction

154671 A square loop of side $10 \mathrm{~cm}$ and resistance $5 \Omega$ is placed vertically in East-West plane. A uniform magnetic field of 1 Tesla is set across the plane in North-East direction. The magnetic field becomes Zero in $700 \mathrm{~ms}$ at a steady rate. The magnitude of induced emf during this interval is

1 $1 \mathrm{mV}$
2 $10 \mathrm{mV}$
3 $100 \mathrm{mV}$
4 $1 \mathrm{~V}$
Electro Magnetic Induction

154667 Two straight conducting rails form a right angle as shown below. A conducting bar in contact with the rails starts at the vertex at time $t=0$ and moves with constant velocity of $v$ $=5 \mathrm{~m} / \mathrm{s}$ along them. A magnetic field with $B=$ $0.1 \mathrm{~T}$ is directed out of the page. The absolute value of the emf around the triangle at the time $\mathrm{t}=4 \mathrm{~s}$ will be ?

1 $10 \mathrm{~V}$
2 $15 \mathrm{~V}$
3 $20 \mathrm{~V}$
4 $30 \mathrm{~V}$
Electro Magnetic Induction

154668 A 800 turns coil of effective area $0.05 \mathrm{~m}^{2}$ is kept perpendicular to a magnetic field $5 \times 10^{-5} \mathrm{~T}$. When the plane of the coil is rotated by $90^{\circ}$ around any of its co-planar axis in $0.1 \mathrm{~s}$, the emf induced in the coil will be

1 $0.2 \mathrm{~V}$
2 $2 \times 10^{-3} \mathrm{~V}$
3 $0.02 \mathrm{~V}$
4 $2 \mathrm{~V}$
Electro Magnetic Induction

154669 A cycle wheel of radius $0.5 \mathrm{~m}$ is rotated with constant angular velocity of $10 \mathrm{rad} / \mathrm{s}$ in a region of magnetic field of $0.1 \mathrm{~T}$ which is perpendicular to the plane of the wheel. The EMF generated between its centre and the rim is

1 $0.25 \mathrm{~V}$
2 $0.125 \mathrm{~V}$
3 $0.5 \mathrm{~V}$
4 zero
Electro Magnetic Induction

154670 A $1 \mathrm{~m}$ long thin metal bar of negligible resistance weighing $1 \mathrm{~kg}$ rests on two metal supports as shown in the figure. The supports are connected in series to an ideal cell and a resistance. A uniform magnetic field $0.5 \mathrm{~T}$ is applied in the region normal to the plane of the paper and into the paper. Maximum emf that the cell can have without breaking the circuit in volt is
(Acceleration due to gravity $=10 \mathrm{~ms}^{-2}$ )

1 $100 \mathrm{~V}$
2 $200 \mathrm{~V}$
3 $400 \mathrm{~V}$
4 $500 \mathrm{~V}$
Electro Magnetic Induction

154671 A square loop of side $10 \mathrm{~cm}$ and resistance $5 \Omega$ is placed vertically in East-West plane. A uniform magnetic field of 1 Tesla is set across the plane in North-East direction. The magnetic field becomes Zero in $700 \mathrm{~ms}$ at a steady rate. The magnitude of induced emf during this interval is

1 $1 \mathrm{mV}$
2 $10 \mathrm{mV}$
3 $100 \mathrm{mV}$
4 $1 \mathrm{~V}$