Which action will increase the strength of the magnetic field?Question response areaSelect one optionincreasing the power of the batteryreversing the polarity of the batterymoving the coils further away from the batterystretching out the coils to make the solenoid longer

f the number of turns in a solenoid is increased, the strength of the magnetic field producedwill

The strength of magnetic field inside a long current carryingstraight solenoid is(a) more at the ends than at the centre(b) minimum in the middle(c) same at all points(d) found to increase from one end to the other

The figure shows a simple electromagnet made of a coil of insulated wire wrapped around an iron nail.When the switch closed, which of the following will make this electromagnet stronger? (i) increasing the number of coils(ii) adding more turns to the coil(iii) increasing the direct current flowing through the coil(iv) changing the direct current flowing through the coil to alternating current.*1 point

A student is experimenting with a permanent bar magnet and a solenoid which has been connected to a sensitive ammeter.  He notices that a small current is registered on the ammeter as the magnet is moved inside the solenoid.  Which of the following will NOT increase the size of this induced current?Increasing the number of turns in the solenoidUsing a stronger bar magnetDecreasing the cross-sectional area of the turns of wire that make up the solenoidMoving the magnet into the solenoid more quickly2A student is experimenting with a permanent bar magnet and a solenoid which has been connected to a sensitive centre-zero ammeter.  She notices that the ammeter needle flicks to one side as the magnet is moved inside the solenoid.  Which of the following will NOT cause the ammeter needle to flick in the opposite direction?Moving the magnet into the solenoid more quicklyPulling the bar magnet out of the solenoidReversing the electrical connections to the ammeterRotating the bar magnet by 180° before moving it into the solenoid3A permanent bar magnet is moved towards a coil of wire which has been connected to a complete electric circuit.  The south pole of the bar magnet is closest to the coil as it is pushed towards it.  Which of the following statements does NOT apply as the bar magnet is moved towards the coil?The side of the coil which is opposite to the bar magnet will become an induced north poleWork is done by the charges inside the coil as the bar magnet is moved towards itWork is done by the bar magnet as it is pushed inside the coilThere will be a repulsive force between the south pole of the bar magnet and the induced south pole of the coil4What is the main energy transfer which occurs inside an alternator?Kinetic to chemicalElectrical to kineticChemical to kineticKinetic to electrical5Which of the following will NOT increase the potential difference induced across a rotating alternator?Increasing the magnetic flux densityDecreasing the number of turns in the coilIncreasing the area of the coilRotating the coil more quickly6Which of the following statements about dynamos is incorrect?A direct current will be induced in a dynamo which is rotated when connected to a complete electric circuitDynamos contain components called brushesDynamos contain components called slip ringsDynamos can be used to power light bulbs and other electrical components

Which of the following shows how to decrease the strength of an electromagnet?Group of answer choicesadd iron center to the coilincrease the number of loops of wire in the coildecrease the number of loops of wire in the coil