To find the direction of the magnetic field around a current-carrying conductor,we use Fleming's left-hand rule.

How many times does an $AC$ electric current with the frequency $50\, Hz$ change its direction in one second?

The direction of the magnetic field produced by a current-carrying straight wire depends on which of the following?

$(a)$ Mention the colour code used for live,neutral,and earth wire.
$(b)$ You want to connect a $2 \ kW$ electric oven in the electric circuit. In which power line would you connect it and why? What may happen if you connect it wrongly in the other power line?

The phenomenon of electromagnetic induction is:

Give the direction of induced current in the following figure: