Grade 10 MAGNETIC EFFECTS OF ELECTRIC CURRENT-1

1. When a bar magnet is broken into two pieces:

• We will have a single pole on each piece
• Each piece will have two unlike poles
• Each piece will have two like poles
• None of these

2. The magnetic field intensity produced due to a current carrying coil is maximum at:

• Any point
• Centre of the coil
• Any point lying on the axis of the coil
• Points lying between centre of the coil and its circumference

3. The direction of magnetic lines of force produced by passing a direct current in a conductor is:

• Perpendicular to the conductor and coming outwards
• Parallel to conductor
• Surrounding the conductor and of circular nature
• Perpendicular to the conductor and coming inwards

4. Which of the following determines the direction of magnetic field due to a current carrying conductor?

• Faraday’s laws of electromagnetic induction
• Fleming’s left-hand rule
• Lenz’s law
• Maxwell’s cork screw rule / Right hand thumb rule

5. The magnetic field inside a long straight solenoid carrying current

• is zero
• decreases as we move towards its end
• increases as we move towards its end
• is same at all points

6. Which of the following correctly describes the magnetic field near a long straight wire?

• The field consists of straight lines perpendicular to the wire
• The field consists of straight lines parallel to the wire
• The field consists of radial lines originating from the wire
• The field consists of concentric circles centered on the wire

7. Magnetic field is produced by the flow of current in a straight wire. This phenomenon was discovered by

• Faraday
• Maxwell
• Coulomb
• Oersted

8. At the time of short circuit, the current in the circuit

• reduces substantially
• Does not change
• increases heavily
• varies continuously

9. The magnetism at the centre of the magnet is

• is zero
• maximum
• minimum
• same as at the poles

10. When the main switch of the house circuit is put off, it disconnects the

• Live wire
• neutral wire
• earth wire
• live and neutral wire