Answer: Option B. -> The direction of the current is parallel to the magnetic field.
:
B
When a current-carrying conductor is placed in a magnetic field, a force is exerted on the conductor. The direction of this force is perpendicular to both the direction of current as well as the direction of the magnetic field(Fleming's left-hand rule).
The conductor will not experience a force if the angle between the current and the magnetic field is $0^{\circ }$ or ${180}^{\circ }$, i.e.,parallel. In all other cases, it experiences a force.

Answer: Option B. -> False
:
B
Live wire has red insulation cover, whereas the earth wire has green insulation colour in the domestic circuits.

Answer: Option C. -> magnetic effect of current
:
C
MCBs are used in houses to protect the household wiring fromexcessive flow of electric current through it. If the current becomes too large, the miniature circuit breaker puts off theswitch, cutting off the electric supply. The MCB can be reset when the fault has been corrected. MCB contains an electromagnet which becomes strong enough to separate a pair of contacts and thus breaksthe circuitwhen the current exceeds the rated value. So, MCBs work on the magnetic effect of electric current.

Answer: Option C. -> Velocity
:
C
When a proton enters a uniform magnetic field, it starts to move in a circular manner. We know that the velocity of the particle changes when it undergoes circular motion as the direction is always changing. Hence, the velocity of the proton changes when it enters into a magnetic field.