Electromagnetic Induction and Effects of Electric Current (Class X)

According to Fleming's left-hand rule, the direction of magnetic field is upwards.
  

This is the correct answer. The function of a commutator ring is to reverse the direction of current flowing.

This is the correct answer. Since the current is induced in the wire by moving it in a magnetic field, so it is called induced current.

Electromagnets can produce a very strong magnetic field. Permanent magnets produce a much weaker field than electromagnets.

This is the correct answer. Galvanometer is used for detecting current in an electric generator.

This is the correct answer. Polarity of an electromagnet can be changed by changing the direction of current.

This is the correct answer. When a rectangular copper coil is rotated in a magnetic field, the direction of the induced current changes every half revolution, due to which, the current in the coil remains the same.

This is the correct answer. Household circuits are connected in parallel because if there is any problem in the circuit, it will not affect the rest of the circuit. Fuses are connected in series because as soon as the current in the circuit exceeds the maximum value, the fuse wire will melt and prevent fire.

This is the correct answer. Electric generator works on Fleming's right-hand rule. Electric dynamo is an electric generator widely used in power stations for producing electric current.

The direction of Earth’s magnetic field is from geographical South to geographical North.
According to Fleming’s left-hand rule, a current-carrying straight conductor placed along West-East direction will be deflected vertically upwards.

Fleming’s Left hand rulestates that if we  stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular. If the first finger points in the direction of magnetic field and the second finger in the direction of current, then the thumb will point in the direction of motion or the force acting on the conductor. 

This is the correct answer. Alternating current changes its direction in every 1/100 s.

This is the correct answer. This prevents overloading in circuit because current drawn is equal to the maximum capacity of the components.

This is the correct answer. When a straight conductor is moved in a magnetic field, current is induced in the circuit.

This is the correct answer. Current drawn by the electric oven, I = P/V = 2000/220 = 9 A. The current exceeds the safe limit of the circuit and hence, the fuse will melt.

No force acts on a charge moving along the direction of a magnetic field.