Magnetic Effects of Electric Current

What happens to a compass needle when it is brought near a bar magnet?

• It breaks.

• It gets deflected.

• It gets attracted to the magnet.

• It remains stationary.

Who discovered the relationship between electricity and magnetism?

• Hans Christian Oersted

• Isaac Newton

• Albert Einstein

• Michael Faraday

What is the direction of the magnetic field lines around a current-carrying straight wire?

• Straight lines parallel to the wire.

• Radial lines originating from the wire.

• Concentric circles centered on the wire.

• Straight lines perpendicular to the wire.

What is the effect of increasing the current in a wire on the deflection of a compass needle placed nearby?

• The compass needle stops working.

• The deflection decreases.

• The deflection remains the same.

• The deflection increases.

What does the right-hand thumb rule help to determine?

• The amount of current flowing.

• The direction of the magnetic field.

• The resistance of the wire.

• The strength of the magnetic field.

What is a solenoid?

• A type of electric fuse.

• A device to measure current.

• A coil of wire that produces a magnetic field.

• A type of magnet.

What happens to the magnetic field inside a solenoid when current flows through it?

• It becomes irregular.

• It disappears.

• It becomes uniform.

• It becomes weaker.

What is the purpose of an electric fuse in a circuit?

• To increase the current.

• To enhance magnetic fields.

• To measure voltage.

• To prevent overloading.

According to Fleming's left-hand rule, what does the thumb represent?

• Direction of force.

• Direction of the magnetic field.

• Direction of current.

• Direction of voltage.

What is the unit of magnetic field strength named after Hans Christian Oersted?

• Ampere

• Tesla

• Volt

• Oersted