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4.Moving Charges and Magnetism
easy
यदि कैथोड किरणों को किसी चुम्बकीय क्षेत्र की लम्बवत् दिशा में प्रक्षेपित किया जाये तब उनका प्रक्षेप्य पथ है
A
दीर्घवृत्त
B
वृत्त
C
परवलय
D
उपरोक्त में से कोई नहीं
Solution
Let the magnetic field be along North direction. Let cathode ray pass perpendicular to the magnetic field towards east.then it gets deflected downwards.
Fleming's left hand rule is meant for the movement of positively charged particles.
But cathode rays are stream of negatively charged electrons. So opposite to the previous one. And like postive charge it will make a circular trajectory.
Standard 12
Physics