A is true but R is false. When current increases in a conductor, the magnetic field becomes stronger. This causes a greater deflection of the compass needle, not a decrease. Thus, assertion is false, while the reason is scientifically correct.
class 10 free sample paper for 2026 board exam
class 10 science half yearly paper on tiwari academy
A current carrying conductor produces a magnetic field around it. When the magnitude of current increases, the strength of the magnetic field also increases. This results in greater deflection of the compass needle. However, the assertion wrongly claims that deflection decreases, while the reason is scientifically correct. Thus, the correct answer is D. Assertion is false but Reason is true.