**Short Questions**

- Under what conditions do a charge affect a magnet?
- State Ampere’s theorem
- Does a charged particle moving through a magnetic field experience a force? Express with conditions, maximum, and minimum force it experiences.
- A portion moving in a straight line enters a strong magnetic field along the field direction. How will its path and velocity change?
- Why is the cylindrical core of soft iron used in moving coil galvanometer?
- Define an Ampere in terms of the force between current carrying conductors.
- How magnetic field is made radial in a moving coil galvanometer?
- Explain how the direction of Lorentz force is determined.
- A current carrying solenoid tends to contract, why?
- A solenoid tends to contract when a current passes through it, why?
- What will be the effect if the magnetic field in a moving coil galvanometer is not radial?
- An electron beam and a portion beam are moving parallel to each other is the beginning. Do they always maintain this status? Justify your answer.
- Deduce an expression for the force between two parallel current carrying conductors. Define one ampere current.
- State Ampere`s circuital theorem.

**Long Questions**

- State Biot-Savart law and obtain the expression for the magnetic field at the centre of the circular coil.
- Explain in brief, the motion of an electron moving normal to a magnetic field.
- Derive an expression for the magnitude of the magnetic flux density at the centre of a narrow circular coil.
- Derive an expression for the magnetic field at a point due to a long straight conductor carrying current.
- What is a Helmholtz coil? Derive an expression for the magnetic field due to this coil.
- Derive the formula for the magnetic field at the centre of the circle of a circular coil carrying current. Explain why the magnetic field at the centre of the coil disappears when the circular coil is made infinitely large.
- State and explain Ampere`s theorem and hence use it to find the magnetic field intensity due to a long current carrying solenoid.
- Derive the formula for the magnetic field at a point due to a long straight current carrying conductor using Biot- Savart law.
- State and explain Biot-Savart law and hence use it to find the magnetic field intensity at any point due to a long straight conductor.
- Find an ex expression for torque on rectangular coil in a uniform magnetic field.
- What is a Helmholtz coil? Derive an expression for the magnetic field due to this coil.
- State and explain Biot-Savart law. Use this law to find the magnetic field intensity at any point due to a long straight current carrying conductor.
- State and explain Boit-Savart law with a case of its application.
- Derive an expression of force per unit length between two parallel conductors separated by distance ‘r’ and carrying currents l1 and l2 in the same direction.
- State and explain Biot-Savart law. Use it to find the magnetic field at the center of a circular coil of N turns and carrying current l.
- Find an expression for the magnetic field on the axis of a solenoid, carrying current, using Ampere`s law.
- Obtain magnetic field straight at a point on the axis of circular current loop by using Biot and Savart law.
- State and explain Ampere`s theorem and hence use it to find the magnetic field due to a long solenoid carrying current l.
- Straight and explain Biot-Savart law and hence use this law to find the magnetic field to a long straight current carrying conductor.
- What is a Helmholtz coil? Derive an expression for the uniform magnetic field obtained from it.

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