Using Lenz's Law

Q. An electric potential difference will be induced between the ends of the conductor shown in the diagram, when the conductor moves in the direction

1. P
2. Q
3. L
4. M

Q. A loop (circuit) is placed in uniform $\overrightarrow{B}$ and flux through the loop is given by $\varphi =4t$. Find the power supplied to the $6\text{V}$ battery.

1. 6 Watt
2. 2 Watt
3. 3 Watt
4. 5 Watt

Q. The magnetic flux linked with a coil at any instant ‘t’ is given by $\varphi =5t^3-100t+300,$ the e.m.f. induced in the coil at t = 2 second is

1. – 40 V
2. 40 V
3. 140 V
4. 300 V

Q. A circular coil of $20{\text{cm}}^2$ area is made of $100$ turns as shown in figure. In $0.2\text{s}$ of time, $\overrightarrow{B}$ reverses its direction of the field. How much charge flows through wire if resistance $R$ is $6\Omega$?

1. 0.32 C
2. 0.64 C
3. 0.28 C
4. 0.16 C

Q. Magnetic flux passing through a coil changes with time as, $\varphi =10t^2+5t+1$ where $\varphi$ is in m wb and t in sec. then magnitude of emf at t = 5s is

1. 0.105 V
2. 0.01V
3. 0.205V
4. 1.2 V

Q. An electric potential difference will be induced between the ends of the conductor shown in the diagram, when the conductor moves in the direction

1. P
2. Q
3. L
4. M

Q. BAR magnet is moving along the axis of a loop & towards it as shown in the figure.

1. $V_A-V_B$ is negative
2. $V_A-V_B$ is zero
3. $V_A-V_B$ is positive
4. No current in the loop

Q. Magnetic flux passing through a coil changes with time as, $\varphi =10t^2+5t+1$ where $\varphi$ is in m wb and t in sec. then magnitude of emf at t = 5s is

1. 0.105 V
2. 0.01V
3. 0.205V
4. 1.2 V

Q. A metallic ring is held horizontally and a magnet is allowed to fall vertically through the ring, then the acceleration of this magnet is

1. Equal to $g$
2. More than $g$
3. Less than $g$
4. Sometimes less and sometimes more than $g$