Magnetic Effects of Electric Current

The force experienced by a current-carrying conductor in a magnetic field is maximum when the conductor is:

1. Parallel to the magnetic field
2. Perpendicular to the magnetic field
3. Outside the magnetic field
4. At rest without current

The magnetic field lines around a bar magnet:

1. Intersect each other
2. Are closed curves
3. Start and end at the same pole
4. Do not have direction

An electric fuse is based on which effect of electric current?

1. Magnetic effect
2. Chemical effect
3. Heating effect
4. Mechanical effect

The direction of induced current is determined by:

1. Fleming's Right-Hand Rule
2. Fleming's Left-Hand Rule
3. Right-Hand Thumb Rule
4. Ohm's Law

The magnetic field produced by a current-carrying coil can be increased by:

1. Reducing current
2. Decreasing number of turns
3. Increasing current
4. Removing the coil

Which device works on the principle of electromagnetic induction?

1. Electric motor
2. Electric generator
3. Electric heater
4. Electric bulb

The phenomenon of producing electric current due to a changing magnetic field is called:

1. Electrolysis
2. Electromagnetic induction
3. Resistance
4. Heating effect

The core used in an electromagnet is generally made of:

1. Steel
2. Copper
3. Soft iron
4. Aluminium

The magnetic field inside a solenoid is:

1. Very weak and irregular
2. Uniform and strong
3. Zero
4. Always changing

Fleming's Left-Hand Rule is used to find:

1. Direction of current
2. Direction of magnetic field
3. Direction of force on conductor
4. Resistance of conductor

The device used to convert electrical energy into mechanical energy is:

1. Generator
2. Motor
3. Transformer
4. Battery

The SI unit of magnetic field is:

1. Tesla
2. Ampere
3. Volt
4. Ohm

The direction of magnetic field around a current-carrying conductor is determined by:

1. Fleming's Left-Hand Rule
2. Fleming's Right-Hand Rule
3. Right-Hand Thumb Rule
4. Joule's Law

Who discovered the relationship between electricity and magnetism?

1. Michael Faraday
2. Hans Christian Oersted
3. Isaac Newton
4. James Clerk Maxwell

The magnetic field around a straight current-carrying conductor is:

1. Circular
2. Straight
3. Elliptical
4. Random

What is the principle behind the working of an electric generator?

1. Reflection of light
2. Electromagnetic induction
3. Electrolysis
4. Thermal expansion

Why is soft iron preferred as the core of an electromagnet?

1. It remains permanently magnetized
2. It can be magnetized and demagnetized easily
3. It has very high electrical resistance
4. It is lighter than all metals

Which device converts mechanical energy into electrical energy?

1. Electric motor
2. Electromagnet
3. Electric generator
4. Resistor

What is an electromagnet?

1. A permanent magnet made of steel
2. A magnet produced by electric current
3. A naturally occurring magnet
4. A non-magnetic material

Which rule helps determine the direction of force on a current-carrying conductor in a magnetic field?

1. Fleming's Left-Hand Rule
2. Fleming's Right-Hand Rule
3. Right-Hand Thumb Rule
4. Lenz's Law

Which device converts electrical energy into mechanical energy?

1. Electric generator
2. Transformer
3. Electric motor
4. Battery

What is the shape of magnetic field lines around a straight current-carrying conductor?

1. Straight lines
2. Elliptical curves
3. Concentric circles
4. Spiral lines

Which rule is used to determine the direction of the magnetic field around a current-carrying conductor?

1. Fleming's Left-Hand Rule
2. Fleming's Right-Hand Rule
3. Right-Hand Thumb Rule
4. Snell's Law

What happens around a conductor when electric current flows through it?

1. A chemical reaction occurs
2. A magnetic field is produced
3. Light is always emitted
4. The conductor becomes non-metallic

Who discovered that electric current produces a magnetic effect?

1. Isaac Newton
2. Hans Christian Oersted
3. Michael Faraday
4. Albert Einstein