Electric current and its effects

Who discovered the magnetic field of electric current?

• Hans Christin Oyster

• James Kristin Oersted

• Lans Christin Oestred

• Hans Christian Oersted

Which of the following cannot be an example for the use of electromagnets

• Electric Bell

• Doorbells

• Oven

• Phone

Where can the key or switch be placed in the circuit?

• The left side of the battery

• The right side of the battery

• Can be placed anywhere in the circuit

• Near the positive terminal of the bulb

The amount of heat produced in a wire depends on

• material

• length

• thickness

• all of these

When an electric current flows through a copper wire AB as shown in Figure, the wire:

• deflects a magnetic needle placed near it

• becomes red hot

• gives electric shock

• behaves like a fuse

The coil of wire contained in an electric heater is known as

• component

• element

• circuit

• spring

Which one of the following is based on the heating effect of current?

• Geyser

• Hair-dryer

• Electric Kettle

• All of the options

In making a battery

(a) the positive terminal of one cell is connected to the negative terminal of the next cell

(b) the positive terminal of one cell is connected to the positive terminal of the next cell

(c) the negative terminal of one cell is connected to the negative terminal of the next cell

(d) none of the above

• a

• b

• c

• d

A battery is a combination of

(a) only single cell

(b) only two cells

(c) two or more cells

(d) None of the above

• a

• b

• c

• d

Our body is a ……………… of electricity.

• Good Conductor

• Bad Conductor

• Bad Insulator

• Good Insulator