##### Class 12^{th} Physics Part I CBSE Solution

**Exercises**- Predict the direction of induced current in the situations described by the following…
- Use Lenz’s law to determine the direction of induced current in the situations described…
- A long solenoid with 15 turns per cm has a small loop of area 2.0 cm^2 placed inside the…
- A rectangular wire loop of sides 8 cm and 2 cm with a small cut is moving out of a region…
- A 1.0 m long metallic rod is rotated with an angular frequency of 400 rad s-1 about an…
- A circular coil of radius 8.0 cm and 20 turns is rotated about its vertical diameter with…
- A horizontal straight wire 10 m long extending from east to west is falling with a speed…
- Current in a circuit falls from 5.0 A to 0.0 A in 0.1 s. If an average emf of 200 V…
- A pair of adjacent coils has a mutual inductance of 1.5 H. If the current in one coil…
- A jet plane is travelling towards west at a speed of 1800 km/h. What is the voltage…

**Additional Exercises**- Suppose the loop in Exercise 6.4 is stationary but the current feeding the electromagnet…
- A square loop of side 12 cm with its sides parallel to X and Y axes is moved with a…
- It is desired to measure the magnitude of field between the poles of a powerful loud…
- Figure 6.20 shows a metal rod PQ resting on the smooth rails AB and positioned between the…
- An air - cored solenoid with length 30 cm, area of cross - section 25 cm^2 and number of…
- Obtain an expression for the mutual inductance between a long straight wire and a square…
- Now assume that the straight wire carries a current of 50 A and the loop is moved to the…
- A line charge Î» per unit length is lodged uniformly onto the rim of a wheel of mass M and…

**Exercises**

- Predict the direction of induced current in the situations described by the following…
- Use Lenz’s law to determine the direction of induced current in the situations described…
- A long solenoid with 15 turns per cm has a small loop of area 2.0 cm^2 placed inside the…
- A rectangular wire loop of sides 8 cm and 2 cm with a small cut is moving out of a region…
- A 1.0 m long metallic rod is rotated with an angular frequency of 400 rad s-1 about an…
- A circular coil of radius 8.0 cm and 20 turns is rotated about its vertical diameter with…
- A horizontal straight wire 10 m long extending from east to west is falling with a speed…
- Current in a circuit falls from 5.0 A to 0.0 A in 0.1 s. If an average emf of 200 V…
- A pair of adjacent coils has a mutual inductance of 1.5 H. If the current in one coil…
- A jet plane is travelling towards west at a speed of 1800 km/h. What is the voltage…

**Additional Exercises**

- Suppose the loop in Exercise 6.4 is stationary but the current feeding the electromagnet…
- A square loop of side 12 cm with its sides parallel to X and Y axes is moved with a…
- It is desired to measure the magnitude of field between the poles of a powerful loud…
- Figure 6.20 shows a metal rod PQ resting on the smooth rails AB and positioned between the…
- An air - cored solenoid with length 30 cm, area of cross - section 25 cm^2 and number of…
- Obtain an expression for the mutual inductance between a long straight wire and a square…
- Now assume that the straight wire carries a current of 50 A and the loop is moved to the…
- A line charge Î» per unit length is lodged uniformly onto the rim of a wheel of mass M and…

###### Exercises

**Question 1.**Predict the direction of induced current in the situations described by the following Figs. 6.18(a) to (f).

**Answer:**The direction of induced current will be given by Lenz’s law.

According to the Lenz’s law: The direction of induced current by change in magnetic field (Faraday’s induction) will be such that it opposes the change that caused it.

As seen from the given figures, the direction of the induced current is shown when the north pole of the magnet is moved towards the closed loop or away from the closed loop.

**Question 1.**

Predict the direction of induced current in the situations described by the following Figs. 6.18(a) to (f).

**Answer:**

The direction of induced current will be given by Lenz’s law.

According to the Lenz’s law: The direction of induced current by change in magnetic field (Faraday’s induction) will be such that it opposes the change that caused it.

As seen from the given figures, the direction of the induced current is shown when the north pole of the magnet is moved towards the closed loop or away from the closed loop.